Start of hardware overlay support in CC with Ubercompositor.

cc/resources/resource_provider.cc

Index: cc/resources/resource_provider.cc
diff --git a/cc/resources/resource_provider.cc b/cc/resources/resource_provider.cc
index ed1d0da5f076d99adbcf21795db87a49477937ef..969d97d83cde9b97d78262aa624e5a4c9dd374ec 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -232,6 +232,7 @@ ResourceProvider::Resource::Resource()
       type(InvalidType),
       format(RGBA_8888),
       has_shared_bitmap_id(false),
+      has_native_buffer_backing(false),
       shared_bitmap(NULL) {}
 
 ResourceProvider::Resource::~Resource() {}
@@ -604,6 +605,11 @@ bool ResourceProvider::IsLost(ResourceId id) {
   return resource->lost;
 }
 
+bool ResourceProvider::HasNativeBufferBacking(ResourceId id) {
+  Resource* resource = GetResource(id);
+  return resource->has_native_buffer_backing;
+}
+
 ResourceProvider::ResourceId ResourceProvider::CreateResource(
     const gfx::Size& size,
     GLint wrap_mode,
@@ -778,6 +784,7 @@ ResourceProvider::ResourceId ResourceProvider::CreateResourceFromTextureMailbox(
   resource.release_callback =
       base::Bind(&SingleReleaseCallback::Run,
                  base::Owned(release_callback.release()));
+  resource.has_native_buffer_backing = mailbox.hw_backed();
   return id;
 }