Add ContextProvider overrides to SynchronousCompositorFactory

content/renderer/android/synchronous_compositor_factory.h

Index: content/renderer/android/synchronous_compositor_factory.h
diff --git a/content/renderer/android/synchronous_compositor_factory.h b/content/renderer/android/synchronous_compositor_factory.h
index 06e7c36faf61bda6a25d84b8440170c9bdcf7b0b..234a0337c47ed3e072f0d9b66ccb94d16cf72e51 100644
--- a/content/renderer/android/synchronous_compositor_factory.h
+++ b/content/renderer/android/synchronous_compositor_factory.h
@@ -13,6 +13,7 @@ class MessageLoopProxy;
 }
 
 namespace cc {
+class ContextProvider;
 class OutputSurface;
 }
 
@@ -39,6 +40,11 @@ class SynchronousCompositorFactory {
   // The factory maintains ownership of the returned interface.
   virtual InputHandlerManagerClient* GetInputHandlerManagerClient() = 0;
 
+  virtual scoped_refptr<cc::ContextProvider>
+      GetOffscreenContextProviderForMainThread() = 0;
+  virtual scoped_refptr<cc::ContextProvider>
+      GetOffscreenContextProviderForCompositorThread() = 0;
+
  protected:
   SynchronousCompositorFactory() {}
   ~SynchronousCompositorFactory() {}