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(
     }
   }
 
-  if (swap_rect == gfx::Rect(frame.size))
-    context_provider_->ContextSupport()->Swap();
-  else
+  if (swap_rect != gfx::Rect(frame.size))

[danakj, 2017/02/14 17:28:58]

Why did you choose this ordering?

I would have assumed that if bounds are given we should use that API so it would
come first, but can you explain?

[halliwell, 2017/02/15 22:29:04]

For now, it seems they are mutually exclusive options (I updated the comment in
OutputFrame to this effect).  GLRenderer chooses either one or the other.  So I
think the order here isn't super important.

     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() {