Re-land: cc: Implement shared worker contexts.

content/browser/android/in_process/synchronous_compositor_factory_impl.h

Index: content/browser/android/in_process/synchronous_compositor_factory_impl.h
diff --git a/content/browser/android/in_process/synchronous_compositor_factory_impl.h b/content/browser/android/in_process/synchronous_compositor_factory_impl.h
index 84ceb030b327285b6496ee5cc1234b440f992d5c..90d6105858aefb76620806137375040e3f5b76e3 100644
--- a/content/browser/android/in_process/synchronous_compositor_factory_impl.h
+++ b/content/browser/android/in_process/synchronous_compositor_factory_impl.h
@@ -28,6 +28,7 @@ class WebGraphicsContext3DInProcessCommandBufferImpl;
 namespace content {
 
 class InProcessChildThreadParams;
+class SynchronousCompositorContextProvider;
 
 class SynchronousCompositorFactoryImpl : public SynchronousCompositorFactory {
  public:
@@ -74,6 +75,7 @@ class SynchronousCompositorFactoryImpl : public SynchronousCompositorFactory {
   scoped_refptr<cc::ContextProvider> CreateContextProviderForCompositor(
       int surface_id,
       CommandBufferContextType type);
+  scoped_refptr<cc::ContextProvider> GetSharedWorkerContextProvider();
   bool CanCreateMainThreadContext();
   scoped_refptr<StreamTextureFactorySynchronousImpl::ContextProvider>
       TryCreateStreamTextureFactory();
@@ -88,6 +90,10 @@ class SynchronousCompositorFactoryImpl : public SynchronousCompositorFactory {
   class VideoContextProvider;
   scoped_refptr<VideoContextProvider> video_context_provider_;
 
+  scoped_refptr<SynchronousCompositorContextProvider> shared_worker_context_;
+  scoped_refptr<cc_blink::ContextProviderWebContext>
+      in_process_shared_worker_context_;
+
   bool use_ipc_command_buffer_;
 
   // |num_hardware_compositor_lock_| is updated on UI thread only but can be