Compute damage rect for Cast video compositing

content/browser/compositor/gpu_browser_compositor_output_surface.cc

 // Copyright 2014 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/compositor/gpu_browser_compositor_output_surface.h"
 
 #include <utility>
 
 #include "build/build_config.h"
 #include "cc/output/output_surface_client.h"
@@ skipping 87 matching lines @@
   if (reflector_) {
     if (swap_rect == gfx::Rect(surface_size)) {
       reflector_texture_->CopyTextureFullImage(surface_size);
       reflector_->OnSourceSwapBuffers(surface_size);
     } else {
       reflector_texture_->CopyTextureSubImage(swap_rect);
       reflector_->OnSourcePostSubBuffer(swap_rect, surface_size);
     }
   }
 
-  if (swap_rect == gfx::Rect(frame.size))
+  if (frame.swap_with_damage_rect != gfx::Rect(frame.size))
+    context_provider_->ContextSupport()->SwapWithDamage(
+        frame.swap_with_damage_rect);
+  else if (swap_rect == gfx::Rect(frame.size))
     context_provider_->ContextSupport()->Swap();
   else
     context_provider_->ContextSupport()->PartialSwapBuffers(swap_rect);
 }
 
 uint32_t GpuBrowserCompositorOutputSurface::GetFramebufferCopyTextureFormat() {
   auto* gl = static_cast<ContextProviderCommandBuffer*>(context_provider());
   return gl->GetCopyTextureInternalFormat();
 }
 
@@ skipping 19 matching lines @@
   ContextProviderCommandBuffer* provider_command_buffer =
       static_cast<content::ContextProviderCommandBuffer*>(
           context_provider_.get());
   gpu::CommandBufferProxyImpl* command_buffer_proxy =
       provider_command_buffer->GetCommandBufferProxy();
   DCHECK(command_buffer_proxy);
   return command_buffer_proxy;
 }
 
 }  // namespace content