cc: Make OutputSurfaceFrame::sub_buffer_rect optional

ui/compositor/test/in_process_context_factory.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 "ui/compositor/test/in_process_context_factory.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 61 matching lines @@
   void Reshape(const gfx::Size& size,
                float device_scale_factor,
                const gfx::ColorSpace& color_space,
                bool has_alpha,
                bool use_stencil) override {
     context_provider()->ContextGL()->ResizeCHROMIUM(
         size.width(), size.height(), device_scale_factor, has_alpha);
   }
   void SwapBuffers(cc::OutputSurfaceFrame frame) override {
     DCHECK(context_provider_.get());
-    if (frame.sub_buffer_rect == gfx::Rect(frame.size)) {
+    if (frame.sub_buffer_rect) {
+      context_provider_->ContextSupport()->PartialSwapBuffers(
+          *frame.sub_buffer_rect);
+    } else {
       context_provider_->ContextSupport()->Swap();
-    } else {
-      context_provider_->ContextSupport()->PartialSwapBuffers(
-          frame.sub_buffer_rect);
     }
     gpu::gles2::GLES2Interface* gl = context_provider_->ContextGL();
     const uint64_t fence_sync = gl->InsertFenceSyncCHROMIUM();
     gl->ShallowFlushCHROMIUM();
 
     gpu::SyncToken sync_token;
     gl->GenUnverifiedSyncTokenCHROMIUM(fence_sync, sync_token.GetData());
 
     context_provider_->ContextSupport()->SignalSyncToken(
         sync_token, base::Bind(&DirectOutputSurface::OnSwapBuffersComplete,
@@ skipping 239 matching lines @@
     data->surface_handle = tracker->AddSurfaceForNativeWidget(widget);
 #endif
   }
 
   PerCompositorData* return_ptr = data.get();
   per_compositor_data_[compositor] = std::move(data);
   return return_ptr;
 }
 
 }  // namespace ui