Corrects uses of setup as a verb to 'set up', leaves noun/noun-phrase
forms of setup as 'setup'. Also settles on 'teardown' as opposed to
tear-down for consistency across the codebase.

A few other minor comment/wording corrections.

* Revert "Remove GetExternalViewEmbedder from surface (#22272)"

This reverts commit 5419f70f.

* Revert "Rasterizer is initialized with an external view embedder (#22405)"

This reverts commit f95df42e.

This decouples surfaces from view embedders.

Cleans up header order/grouping for consistency: associated header, C/C++ system/standard library headers, library headers, platform-specific #includes.

Adds <cstring> where strlen, memcpy are being used: there are a bunch of places we use them transitively.

Applies linter-required cleanups. Disables linter on one file due to included RapidJson header. See https://github.com/flutter/flutter/issues/65676

This patch does not cover flutter/shell/platform/darwin. There's a separate, slightly more intensive cleanup for those in progress.

This is part of a larger effort to expose the difference between GrDirectContext,
which runs on the GPU thread and can directly perform operations like uploading
textures, and GrRecordingContext, which can only queue up work to be delivered
to the GrDirectContext later.

* Hook up PersistentCache to ShellTestPlatformViewVulkan

* [vulkan][fuchsia] enable vulkan without swiftshader in fuchsia tests on arm64

* [vulkan][fuchsia] Disable second half of ShellTest.CacheSkSLWorks on
vulkan backend

GrContext::precompileShader() is not implemented for vulkan contexts, so
dont run the portion of this test that depends on that behavior on
Vulkan.
Co-authored-by: NGeorge Wright <gw280@google.com>

This reverts commit f6b8eda7.

Flush the SkCanvas when submitting a frame in ShellTestPlatformViewVulkan::OffscreenSurface (#16717)

This change creates a test only implementation of flutter::Surface backed by an
offscreen Vulkan GrContext. Much of the code in this test Surface was lifted
from flutter::VulkanWindow which I was unable to use without extricating it
from the VkSurface/VkSwapchain code which we do not want to use in offscreen
tests. I would recommend refactoring VulkanWindow to separate GrContext
creation and VkSwapchain creation in order to promote greater code reuse
between onscreen and offscreen vulkan paths.

This change is excersised thoroughly by the shell tests and was manually
tested against these tests on Fuchsia on Intel.

This reverts commit 594f6608.

This change creates a test only implementation of flutter::Surface backed by an
offscreen Vulkan GrContext. Much of the code in this test Surface was lifted
from flutter::VulkanWindow which I was unable to use without extricating it
from the VkSurface/VkSwapchain code which we do not want to use in offscreen
tests. I would recommend refactoring VulkanWindow to separate GrContext
creation and VkSwapchain creation in order to promote greater code reuse
between onscreen and offscreen vulkan paths.

This change is excersised thoroughly by the shell tests and was manually
tested against these tests on Fuchsia on Intel.

This also adds a dependency on SwiftShader's Vulkan frontend.