Add logic to GLRenderer to support RenderPassDrawQuad copying.

cc/resources/resource_provider.h

Index: cc/resources/resource_provider.h
diff --git a/cc/resources/resource_provider.h b/cc/resources/resource_provider.h
index 4f38ca95f89b183545fd4d72642ee2d3a24b2518..1327d87c5fd5d18f219da2bca3e8dd8399dab146 100644
--- a/cc/resources/resource_provider.h
+++ b/cc/resources/resource_provider.h
@@ -220,6 +220,7 @@ class CC_EXPORT ResourceProvider
     unsigned texture_id() const { return texture_id_; }
     GLenum target() const { return target_; }
     const gfx::Size& size() const { return size_; }
+    ResourceId resource_id() const { return resource_id_; }
 
    private:
     ResourceProvider* resource_provider_;