Platform messages are only support in the UI isolate.  Secondary isolates
do not have a window that can receive incoming messages, and outgoing messages
are not tagged with a destination isolate and thus will always be dispatched
to the UI isolate.

Fixes https://github.com/flutter/flutter/issues/16846

Auto-roller completed checks. Merging.

Auto-roller completed checks. Merging.

Auto-roller completed checks. Merging.

This reverts commit 9859af12.

Picks up a fix for math on 32bit ARM devices running iOS, required for https://github.com/flutter/flutter/issues/2089.

Fixes https://github.com/flutter/flutter/issues/16222

Auto-roller completed checks. Merging.

Auto-roller completed checks. Merging.

See https://github.com/flutter/flutter/issues/16846

https://skia.googlesource.com/skia.git/+log/3d0e8507face..5209d7fce35f

$ git log 3d0e8507f..5209d7fce --date=short --no-merges --format='%ad %ae %s'
2018-04-20 bsalomon Fix starting location in GrRTC::drawOval when converting to GrShape
2018-04-20 bsalomon Analytic dashing of circles with single on/off intervals and butt caps.
2018-04-20 brianosman Fix argument names and documentation for SkMatrix44::set3x3()
2018-04-18 enne Reland "Add stub gpu workaround generators"
2018-04-20 robertphillips Add ability to dump opList info at flush-time
2018-04-20 benjaminwagner Fix Housekeeper-PerCommit-InfraTests
2018-04-20 scroggo Reduce threads used for DNG decodes on Android
2018-04-19 benjaminwagner Add SwiftShader Build jobs.
2018-04-19 benjaminwagner Add cmake_linux asset.
2018-04-20 egdaniel Add discard check when deciding if we should execute op list or not.
2018-04-20 robertphillips Remove another writePixels instance
2018-04-18 csmartdalton ccpr: Don't solve for cubic roots that are out of range
2018-04-19 benjaminwagner Add SwiftShader to DEPS.
2018-04-19 csmartdalton ccpr: Fix flatness and triangle-ness detection for conics

Created with:
  roll-dep src/third_party/skia

Fixes https://github.com/flutter/flutter/issues/16635

See https://github.com/flutter/flutter/issues/16748
and https://github.com/flutter/flutter/issues/16456

https://skia.googlesource.com/skia.git/+log/c4e384e5ad85..3d0e8507face

$ git log c4e384e5a..3d0e8507f --date=short --no-merges --format='%ad %ae %s'
2018-04-20 robertphillips Prevent matrix stack from being corrupted if a rotated image filter is clipped out
2018-04-20 caryclark guard against NaN in path is rect
2018-04-19 fmalita Fix use-of-uninitialized-value in SkPictureShader::onMakeContext
2018-04-19 benjaminwagner Disable retries for Build, CT, and Calmbench tasks.
2018-04-20 angle-skia-autoroll Roll third_party/externals/angle2/ b0f917fa6..3ec304dba (1 commit)
2018-04-20 angle-skia-autoroll Roll third_party/externals/angle2/ e24032a2c..b0f917fa6 (3 commits)
2018-04-19 csmartdalton ccpr: Don't preempt the convex path renderer
2018-04-19 benjaminwagner Add more angle_gl_* configs for NVIDIA.
2018-04-19 jvanverth Remove ambient clamp hack for analytic shadows.
2018-04-19 brianosman Remove duplicate predefined configs
2018-04-18 csmartdalton ccpr: Clean up GrCCGeometry
2018-04-19 herb Adding pinning to the strike cache
2018-04-19 bsalomon Fix double counting of coverage in analytic round capped stroked circles.
2018-04-11 bungeman Document minimum OS requirements.
2018-04-19 angle-skia-autoroll Roll third_party/externals/angle2/ eeec3b14c..e24032a2c (2 commits)
2018-04-18 robertphillips rm SkRRectsGaussianEdgeMaskFilter
2018-04-19 borenet [skcms] Add version.sha1
2018-04-19 mtklein crash rather than overflow in SkTDArray

Created with:
  roll-dep src/third_party/skia

getBitmap had been doing FXL_CHECK assertions to check memory allocation
failures and other errors.  getBitmap will now return null to the caller
instead.
(The VM may throw OutOfMemoryError or other exceptions if JNI APIs fail)

Fixes https://github.com/flutter/flutter/issues/16750

This matches the behavior from before the shell refactoring.

Fixes https://github.com/flutter/flutter/issues/16754

AccessibilityBridge support for edge triggered semantics (iOS + Android) 

https://skia.googlesource.com/skia.git/+log/1ccaa6e05629..c4e384e5ad85

$ git log 1ccaa6e05..c4e384e5a --date=short --no-merges --format='%ad %ae %s'
2018-04-19 reed check if we fail to eval the conic in pathmeasure
2018-04-19 bungeman Remove unused parameters from internalGetPath.
2018-04-19 egdaniel When creating testing backendTexture take colorspace into account.
2018-04-19 kjlubick Fix Chromecast bots
2018-04-19 borenet [infra] gen_tasks: Pass internal hardware ID as a property
2018-04-18 herb Untangle strike cache and glyph cache
2018-04-19 mtklein disallow negative setReserve() calls
2018-04-19 mtklein rm SkTDArray::select()
2018-04-19 mtklein clean up setReserve() rule-bending
2018-04-18 scroggo Remove the limit on dng allocations
2018-04-19 scroggo Revert "Add stub gpu workaround generators"
2018-04-19 caryclark path is rect track corners
2018-04-17 borenet Reland "[infra] Run recipes through Kitchen"
2018-04-19 angle-skia-autoroll Roll third_party/externals/angle2/ aaa19de06..eeec3b14c (1 commit)
2018-04-18 angle-skia-autoroll Roll third_party/externals/angle2/ 5804dc8ea..aaa19de06 (9 commits)
2018-04-18 enne Add stub gpu workaround generators
2018-04-18 herb Move strike cache Find*() to strike cache
2018-04-18 liyuqian Remove SK_SUPPORT_LEGACY_PATH_DAA_BIT
2018-04-18 fmalita Prevent unnecessary/unbounded growth of SkTDynamicHash capacity
2018-04-18 bungeman DFT to draw A8 instead of incorrect vertical lcd.
2018-04-18 csmartdalton ccpr: Implement conics
2018-04-18 csmartdalton Always call endFlush on opLists that might survive a flush
2018-04-18 fmalita Convert A8 D32 mask blitters to Sk4px
2018-04-18 liyuqian Reland "Fix the fat rect bug in the threaded backend"
2018-04-18 halcanary SkQP: speed up tools/skqp/make_apk_list\
2018-04-18 brianosman Support all destination profiles in SkColorSpaceXform_skcms
2018-04-17 brianosman With ES3, enable both ES2 and ES3 external image extensions
2018-04-18 caryclark fix path is rect flaw exposed by gold

Created with:
  roll-dep src/third_party/skia

If the start/end range passed to GetRectsForRange includes lines of text
that did not render any glyphs, then GetRectsForRange should add a placeholder
for that line.  In particular, the framework expects this so that it can
position the cursor on an empty line when editing text.

Fixes https://github.com/flutter/flutter/issues/16418

The WeakPtrFactory must be deleted on the thread where it was created.
However, the service isolate is created and destroyed on threads from
the Dart thread pool, and the creating thread may not be the same as
the destroying thread.

Creating a dylib from a “complete” static library does not propagate symbol visisbility definitions. I also got rid of the static library and used a source set instead because we don’t need to do the extra work for other targets.

"flutter build bundle" in Dart 2 mode now builds an assets directory
containing the application and platform kernels along with the app's other
assets.

With this patch, embedders can run these bundles by setting
FlutterProjectArgs.assets_path to the bundle directory.  In this scenario,
FlutterProjectArgs.main_path and packages_path will be ignored.