cc: make resource keep video buffer format for hardware overlay.

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 9d06c6d7449e910f454999d83b488e20787b1a22..37e9a9b3cade524a6a3f791c5e65db0457be2315 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -670,6 +670,7 @@ ResourceId ResourceProvider::CreateBitmap(const gfx::Size& size,
 
 ResourceId ResourceProvider::CreateResourceFromTextureMailbox(
     const TextureMailbox& mailbox,
+    gfx::BufferFormat buffer_format,
     std::unique_ptr<SingleReleaseCallbackImpl> release_callback_impl,
     bool read_lock_fences_enabled) {
   DCHECK(thread_checker_.CalledOnValidThread());
@@ -693,6 +694,7 @@ ResourceId ResourceProvider::CreateResourceFromTextureMailbox(
         id, Resource(pixels, shared_bitmap, mailbox.size_in_pixels(),
                      Resource::EXTERNAL, GL_LINEAR));
   }
+  resource->buffer_format = buffer_format;
   resource->allocated = true;
   resource->set_mailbox(mailbox);
   resource->color_space = mailbox.color_space();
@@ -716,8 +718,9 @@ ResourceId ResourceProvider::CreateResourceFromTextureMailbox(
 ResourceId ResourceProvider::CreateResourceFromTextureMailbox(
     const TextureMailbox& mailbox,
     std::unique_ptr<SingleReleaseCallbackImpl> release_callback_impl) {
-  return CreateResourceFromTextureMailbox(
-      mailbox, std::move(release_callback_impl), false);
+  return CreateResourceFromTextureMailbox(mailbox, gfx::BufferFormat::RGBA_8888,
+                                          std::move(release_callback_impl),
+                                          false);
 }
 
 void ResourceProvider::DeleteResource(ResourceId id) {