cc: Make OutputSurfaceFrame::sub_buffer_rect optional

content/browser/renderer_host/compositor_impl_android.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/compositor_impl_android.h"
 
 #include <android/bitmap.h>
 #include <android/native_window_jni.h>
 #include <stdint.h>
 #include <unordered_set>
@@ skipping 139 matching lines @@
             new display_compositor::
                 CompositorOverlayCandidateValidatorAndroid()),
         weak_ptr_factory_(this) {
     capabilities_.max_frames_pending = kMaxDisplaySwapBuffers;
   }
 
   ~AndroidOutputSurface() override = default;
 
   void SwapBuffers(cc::OutputSurfaceFrame frame) override {
     GetCommandBufferProxy()->SetLatencyInfo(frame.latency_info);
-    if (frame.sub_buffer_rect.IsEmpty()) {
+    if (frame.sub_buffer_rect) {
+      DCHECK(frame.sub_buffer_rect->IsEmpty());
       context_provider_->ContextSupport()->CommitOverlayPlanes();
     } else {
-      DCHECK(frame.sub_buffer_rect == gfx::Rect(frame.size));
       context_provider_->ContextSupport()->Swap();
     }
   }
 
   void BindToClient(cc::OutputSurfaceClient* client) override {
     DCHECK(client);
     DCHECK(!client_);
     client_ = client;
     GetCommandBufferProxy()->SetSwapBuffersCompletionCallback(
         base::Bind(&AndroidOutputSurface::OnSwapBuffersCompleted,
@@ skipping 588 matching lines @@
   ui::ContextProviderFactory::GetInstance()
       ->GetSurfaceManager()
       ->UnregisterFrameSinkHierarchy(frame_sink_id_, frame_sink_id);
 }
 
 bool CompositorImpl::HavePendingReadbacks() {
   return !readback_layer_tree_->children().empty();
 }
 
 }  // namespace content