Preliminary compositor disabling patch.

cc/surfaces/display.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 "cc/surfaces/display.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/debug/benchmark_instrumentation.h"
 #include "cc/output/compositor_frame.h"
@@ skipping 129 matching lines @@
   stored_latency_info_.clear();
   bool have_copy_requests = false;
   for (const auto* pass : frame_data->render_pass_list) {
     have_copy_requests |= !pass->copy_requests.empty();
   }
 
   gfx::Size surface_size;
   bool have_damage = false;
   if (!frame_data->render_pass_list.empty()) {
     surface_size = frame_data->render_pass_list.back()->output_rect.size();
-    have_damage =
-        !frame_data->render_pass_list.back()->damage_rect.size().IsEmpty();
+    have_damage = !frame_data->render_pass_list.back()->damage_rect.IsEmpty() ||
+                  !frame_data->render_pass_list.back()->overlay_rect.IsEmpty();
   }
   bool avoid_swap = surface_size != current_surface_size_;
   bool should_draw = !frame->metadata.latency_info.empty() ||
                      have_copy_requests || (have_damage && !avoid_swap);
 
   if (should_draw) {
     gfx::Rect device_viewport_rect = gfx::Rect(current_surface_size_);
     gfx::Rect device_clip_rect = device_viewport_rect;
     bool disable_picture_quad_image_filtering = false;
 
@@ skipping 58 matching lines @@
 
 int Display::GetMaxFramesPending() {
   int max_frames_pending =
       output_surface_ ? output_surface_->capabilities().max_frames_pending : 0;
   if (max_frames_pending <= 0)
     max_frames_pending = OutputSurface::DEFAULT_MAX_FRAMES_PENDING;
   return max_frames_pending;
 }
 
 }  // namespace cc