cc: Route offscreen context creation for compositor to the browser.

cc/resource_provider.h

Index: cc/resource_provider.h
diff --git a/cc/resource_provider.h b/cc/resource_provider.h
index 70d4ad1a251a6d21893dcb9425aa3c64b82efdbc..722b1a8ef99548d9716b9bbc560395040c607d55 100644
--- a/cc/resource_provider.h
+++ b/cc/resource_provider.h
@@ -15,6 +15,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "cc/cc_export.h"
+#include "cc/grcontext_provider.h"
 #include "cc/output_surface.h"
 #include "cc/texture_copier.h"
 #include "cc/texture_mailbox.h"
@@ -262,6 +263,9 @@ public:
     // Indicates if we can currently lock this resource for write.
     bool canLockForWrite(ResourceId);
 
+    GrContextProvider* offscreenContextProvider() { return &m_offscreenContextProvider; }
+    void setOffscreenContexts(WebKit::WebGraphicsContext3D* context3d, GrContext* grContext) { m_offscreenContextProvider.set_contexts(context3d, grContext); }
+
 private:
     struct Resource {
         Resource();
@@ -333,6 +337,8 @@ private:
     int m_maxTextureSize;
     GLenum m_bestTextureFormat;
 
+    GrContextProvider m_offscreenContextProvider;
+
     base::ThreadChecker m_threadChecker;
 
     scoped_refptr<Fence> m_currentReadLockFence;