Fix large mis-paint when resizing windows aura chrome

ui/compositor/compositor.cc

 // Copyright (c) 2012 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/compositor.h"
 
 #include <algorithm>
 #include <deque>
 
 #include "base/bind.h"
@@ skipping 392 matching lines @@
 
 Compositor::Compositor(CompositorDelegate* delegate,
                        gfx::AcceleratedWidget widget)
     : delegate_(delegate),
       root_layer_(NULL),
       widget_(widget),
       posted_swaps_(new PostedSwapQueue()),
       device_scale_factor_(0.0f),
       last_started_frame_(0),
       last_ended_frame_(0),
+      next_draw_is_resize_(false),
       disable_schedule_composite_(false),
       compositor_lock_(NULL) {
   root_web_layer_ = cc::Layer::Create();
   root_web_layer_->SetAnchorPoint(gfx::PointF(0.f, 0.f));
 
   CommandLine* command_line = CommandLine::ForCurrentProcess();
 
   cc::LayerTreeSettings settings;
   settings.refresh_rate =
       g_test_compositor_enabled ? kTestRefreshRate : kDefaultRefreshRate;
@@ skipping 97 matching lines @@
   if (!root_layer_)
     return;
 
   last_started_frame_++;
   PendingSwap pending_swap(DRAW_SWAP, posted_swaps_.get());
   if (!IsLocked()) {
     // TODO(nduca): Temporary while compositor calls
     // compositeImmediately() directly.
     Layout();
     host_->Composite(base::TimeTicks::Now());
+
+#if defined(OS_WIN)
+    // While we resize, we are usually a few frames behind. By blocking
+    // the UI thread here we minize the area that is mis-painted, specially
+    // in the non-client area. See RenderWidgetHostViewAura::SetBounds for
+    // more details and bug 177115.
+    if (next_draw_is_resize_ && (last_ended_frame_ > 1)) {
+      next_draw_is_resize_ = false;
+      host_->FinishAllRendering();
+    }
+#endif
+
   }
   if (!pending_swap.posted())
     NotifyEnd();
 }
 
 void Compositor::ScheduleFullDraw() {
   host_->SetNeedsRedraw();
 }
 
 bool Compositor::ReadPixels(SkBitmap* bitmap,
@@ skipping 10 matching lines @@
   PendingSwap pending_swap(READPIXELS_SWAP, posted_swaps_.get());
   return host_->CompositeAndReadback(pixels, bounds_in_pixel);
 }
 
 void Compositor::SetScaleAndSize(float scale, const gfx::Size& size_in_pixel) {
   DCHECK_GT(scale, 0);
   if (!size_in_pixel.IsEmpty()) {
     size_ = size_in_pixel;
     host_->SetViewportSize(size_in_pixel, size_in_pixel);
     root_web_layer_->SetBounds(size_in_pixel);
+
+    next_draw_is_resize_ = true;
   }
   if (device_scale_factor_ != scale) {
     device_scale_factor_ = scale;
     if (root_layer_)
       root_layer_->OnDeviceScaleFactorChanged(scale);
   }
 }
 
 void Compositor::SetBackgroundColor(SkColor color) {
   host_->set_background_color(color);
@@ skipping 159 matching lines @@
 COMPOSITOR_EXPORT void DisableTestCompositor() {
   ResetImplicitFactory();
   g_test_compositor_enabled = false;
 }
 
 COMPOSITOR_EXPORT bool IsTestCompositorEnabled() {
   return g_test_compositor_enabled;
 }
 
 }  // namespace ui