Use SwapBuffersWithBounds on Chromecast

cc/output/gl_renderer.cc

Index: cc/output/gl_renderer.cc
diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index f9cc3d71c3a232ca1d4b6aef52354891ed7e18c8..490e5d984e189772af45f842ad65a4c35ad2f223 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -401,6 +401,7 @@ GLRenderer::GLRenderer(const RendererSettings* settings,
   use_blend_equation_advanced_coherent_ =
       context_caps.blend_equation_advanced_coherent;
   use_occlusion_query_ = context_caps.occlusion_query;
+  use_swap_with_bounds_ = context_caps.swap_buffers_with_bounds;
 
   InitializeSharedObjects();
 }
@@ -2632,7 +2633,11 @@ void GLRenderer::SwapBuffers(std::vector<ui::LatencyInfo> latency_info) {
   OutputSurfaceFrame output_frame;
   output_frame.latency_info = std::move(latency_info);
   output_frame.size = surface_size;
-  if (use_partial_swap_) {
+  if (use_swap_with_bounds_) {
+    output_frame.content_bounds = current_frame()->root_content_bounds;
+    swap_buffer_rect_ = gfx::Rect(surface_size);

[danakj, 2017/02/16 18:54:19]

Do you intentionally overload not supporting empty swaps with swap_with_bounds_?
See the else case below.

[halliwell, 2017/02/23 18:01:46]

Correct.  The case of allow_empty_swap_ when use_partial_swap_ is false
corresponds to calling CommitOverlayPlanes instead of Swap.

+    output_frame.sub_buffer_rect = swap_buffer_rect_;
+  } else if (use_partial_swap_) {
     // If supported, we can save significant bandwidth by only swapping the
     // damaged/scissored region (clamped to the viewport).
     swap_buffer_rect_.Intersect(gfx::Rect(surface_size));