Add ContextProvider overrides to SynchronousCompositorFactory

content/browser/android/in_process/synchronous_compositor_impl.cc

Index: content/browser/android/in_process/synchronous_compositor_impl.cc
diff --git a/content/browser/android/in_process/synchronous_compositor_impl.cc b/content/browser/android/in_process/synchronous_compositor_impl.cc
index 4b70c9b455256ea72c1591beb3dc358d60782cc5..3ebe4a0363c7c20466beca4532e26e6d241d4440 100644
--- a/content/browser/android/in_process/synchronous_compositor_impl.cc
+++ b/content/browser/android/in_process/synchronous_compositor_impl.cc
@@ -11,6 +11,7 @@
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/renderer/android/synchronous_compositor_factory.h"
+#include "webkit/common/gpu/context_provider_in_process.h"
 
 namespace content {
 
@@ -49,6 +50,25 @@ class SynchronousCompositorFactoryImpl : public SynchronousCompositorFactory {
         new SynchronousCompositorOutputSurface(routing_id));
     return output_surface.PassAs<cc::OutputSurface>();
   }
+
+  virtual scoped_refptr<cc::ContextProvider>
+      OffscreenContextProviderForMainThread() OVERRIDE {
+    // Synchronous compositor does not support main thread context yet.
+    return scoped_refptr<cc::ContextProvider>();
+  }
+
+  virtual scoped_refptr<cc::ContextProvider>
+      OffscreenContextProviderForCompositorThread() OVERRIDE {
+    if (!offscreen_context_for_compositor_thread_ ||
+        offscreen_context_for_compositor_thread_->DestroyedOnMainThread()) {
+      offscreen_context_for_compositor_thread_ =
+          webkit::gpu::ContextProviderInProcess::Create();
+    }
+    return offscreen_context_for_compositor_thread_;
+  }
+
+ private:
+  scoped_refptr<cc::ContextProvider> offscreen_context_for_compositor_thread_;
 };
 
 base::LazyInstance<SynchronousCompositorFactoryImpl>::Leaky g_factory =