Rename skyx to flx in sky.

This is needed for coordination with sky_tools development.

sky/shell/BUILD.gn

@@ -176,7 +176,7 @@ if (is_android) {
     native_libs = [ "libsky_shell.so" ]
     asset_location = "$root_build_dir/sky_shell/assets"
 
-    extensions_to_not_compress = ".skyx"
+    extensions_to_not_compress = ".flx"
 
     deps = [
       ":assets",

sky/shell/android/org/domokit/sky/shell/SkyApplication.java

@@ -35,7 +35,7 @@ import org.domokit.vsync.VSyncProviderImpl;
  */
 public class SkyApplication extends BaseChromiumApplication {
     static final String SNAPSHOT = "snapshot_blob.bin";
-    static final String APP_BUNDLE = "app.skyx";
+    static final String APP_BUNDLE = "app.flx";
     static final String MANIFEST = "sky.yaml";
 
     private static final String TAG = "SkyApplication";

sky/shell/ios/sky_surface.mm

@@ -186,13 +186,13 @@ static std::string SkPictureTracingPath() {
 }
 
 - (NSString*)skyInitialBundleURL {
-  NSString *skyxBundlePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"skyx"];
+  NSString *flxBundlePath = [[NSBundle mainBundle] pathForResource:@"app" ofType:@"flx"];
 #ifndef NDEBUG
   NSFileManager *fileManager = [NSFileManager defaultManager];
   NSError *error = nil;
   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
   NSString *documentsDirectory = [paths objectAtIndex:0];
-  NSString *skyxDocsPath = [documentsDirectory stringByAppendingPathComponent:@"app.skyx"];
+  NSString *flxDocsPath = [documentsDirectory stringByAppendingPathComponent:@"app.flx"];
 
   // Write an empty file to help identify the correct simulator app by its bundle id. See sky_tool for its use.
   NSString *bundleIDPath = [documentsDirectory stringByAppendingPathComponent:[[NSBundle mainBundle] bundleIdentifier]];
@@ -201,16 +201,16 @@ static std::string SkPictureTracingPath() {
       NSLog(@"Couldn't write the bundle id file %@: auto reloading on the iOS simulator won't work\n%@", bundleIDPath, error);
   }
 
-  if (skyxBundlePath != nil && [fileManager fileExistsAtPath:skyxDocsPath] == NO) {
-    if ([fileManager copyItemAtPath:skyxBundlePath toPath:skyxDocsPath error:&error]) {
-      return skyxDocsPath;
+  if (flxBundlePath != nil && [fileManager fileExistsAtPath:flxDocsPath] == NO) {
+    if ([fileManager copyItemAtPath:flxBundlePath toPath:flxDocsPath error:&error]) {
+      return flxDocsPath;
     }
-    NSLog(@"Error encountered copying app.skyx from the Bundle to the Documents directory. Dynamic reloading will not be possible. %@", error);
-    return skyxBundlePath;
+    NSLog(@"Error encountered copying app.flx from the Bundle to the Documents directory. Dynamic reloading will not be possible. %@", error);
+    return flxBundlePath;
   }
-  return skyxDocsPath;
+  return flxDocsPath;
 #endif
-  return skyxBundlePath;
+  return flxBundlePath;
 }
 
 - (void)connectToEngineAndLoad {

sky/shell/mac/sky_window.mm

@@ -73,13 +73,13 @@ static inline sky::EventType EventTypeFromNSEventPhase(NSEventPhase phase) {
 }
 
 - (NSString*)skyInitialBundleURL {
-  return [[NSBundle mainBundle] pathForResource:@"app" ofType:@"skyx"];
+  return [[NSBundle mainBundle] pathForResource:@"app" ofType:@"flx"];
 }
 
 // TODO(eseidel): This does not belong in sky_window!
 // Probably belongs in NSApplicationDelegate didFinishLaunching.
 // We also want a separate setup for normal apps vs SkyShell
-// normal apps only use a skyx vs. SkyShell which always pulls from network.
+// normal apps only use a flx vs. SkyShell which always pulls from network.
 - (void)setupAndLoadDart {
   auto interface_request = mojo::GetProxy(&_sky_engine);
   self.platformView->ConnectToEngine(interface_request.Pass());