Use SwapBuffersWithBounds on Chromecast

content/browser/compositor/gpu_browser_compositor_output_surface.cc

Index: content/browser/compositor/gpu_browser_compositor_output_surface.cc
diff --git a/content/browser/compositor/gpu_browser_compositor_output_surface.cc b/content/browser/compositor/gpu_browser_compositor_output_surface.cc
index 8ad8384dbaf8e62208841f95deb10c877d651ceb..ba28a06f56ee14b67cf0f5c9a6ede49d17941948 100644
--- a/content/browser/compositor/gpu_browser_compositor_output_surface.cc
+++ b/content/browser/compositor/gpu_browser_compositor_output_surface.cc
@@ -108,10 +108,12 @@ void GpuBrowserCompositorOutputSurface::SwapBuffers(
     }
   }
 

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

this could DCHECK that we don't have both partial swap and content_bounds? maybe
it needs to consider empty swaps tho? (see comments in GLRenderer)

[halliwell, 2017/02/23 18:01:47]

Done (btw, empty swap can only happen here through PartialSwap.  The special
case for empty swap in GLRenderer corresponds to calling CommitOverlayPlanes,
which is used here:
https://cs.chromium.org/chromium/src/content/browser/renderer_host/compositor...
 )

-  if (swap_rect == gfx::Rect(frame.size))
-    context_provider_->ContextSupport()->Swap();
-  else
+  if (swap_rect != gfx::Rect(frame.size))
     context_provider_->ContextSupport()->PartialSwapBuffers(swap_rect);
+  else if (!frame.content_bounds.empty())
+    context_provider_->ContextSupport()->SwapWithBounds(frame.content_bounds);
+  else
+    context_provider_->ContextSupport()->Swap();
 }
 
 uint32_t GpuBrowserCompositorOutputSurface::GetFramebufferCopyTextureFormat() {