Remove RequestAnimationFrame from mojo, add delayed tasks to RunLoop

mojo/public/c/gles2/gles2.h

Index: mojo/public/c/gles2/gles2.h
diff --git a/mojo/public/c/gles2/gles2.h b/mojo/public/c/gles2/gles2.h
index 44880afc1eda6c01b4ecb94960b1418230b5fce8..223b1760aad31d95fab803f293f44f6049a5ca25 100644
--- a/mojo/public/c/gles2/gles2.h
+++ b/mojo/public/c/gles2/gles2.h
@@ -24,15 +24,10 @@ MOJO_GLES2_EXPORT void MojoGLES2Terminate(void);
 MOJO_GLES2_EXPORT MojoGLES2Context MojoGLES2CreateContext(
     MojoHandle handle,
     MojoGLES2ContextLost lost_callback,
-    MojoGLES2DrawAnimationFrame animation_callback,
     void* closure);
 MOJO_GLES2_EXPORT void MojoGLES2DestroyContext(MojoGLES2Context context);
 MOJO_GLES2_EXPORT void MojoGLES2MakeCurrent(MojoGLES2Context context);
 MOJO_GLES2_EXPORT void MojoGLES2SwapBuffers(void);
-// TODO(piman): this doesn't belong here.
-MOJO_GLES2_EXPORT void MojoGLES2RequestAnimationFrames(
-    MojoGLES2Context context);
-MOJO_GLES2_EXPORT void MojoGLES2CancelAnimationFrames(MojoGLES2Context context);
 
 // TODO(piman): We shouldn't have to leak those 2 interfaces, especially in a
 // type-unsafe way.