Do FinishAllRendering in WM_WINDOWPOSCHANGING

ui/compositor/compositor.cc

Index: ui/compositor/compositor.cc
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index 788cd484c3ec71d555528ef565af79784f77d7b7..7860192a74d4b81cdd6f218299c78384a3fdd3c8 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -96,7 +96,6 @@ Compositor::Compositor(gfx::AcceleratedWidget widget)
       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),
       defer_draw_scheduling_(false),
@@ -286,18 +285,6 @@ void Compositor::Draw() {
     // compositeImmediately() directly.
     Layout();
     host_->Composite(gfx::FrameTime::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

[cpu_(ooo_6.6-7.5), 2014/05/10 02:36:23]

I might have put this code here :(

Do you know why is busted?

-    // more details and bug 177115.
-    if (next_draw_is_resize_ && (last_ended_frame_ > 1)) {
-      next_draw_is_resize_ = false;
-      host_->FinishAllRendering();
-    }
-#endif
-
   }
   if (swap_state_ == SWAP_NONE)
     NotifyEnd();
@@ -311,6 +298,10 @@ void Compositor::ScheduleRedrawRect(const gfx::Rect& damage_rect) {
   host_->SetNeedsRedrawRect(damage_rect);
 }
 
+void Compositor::FinishAllRendering() {
+  host_->FinishAllRendering();
+}
+
 void Compositor::SetLatencyInfo(const ui::LatencyInfo& latency_info) {
   scoped_ptr<cc::SwapPromise> swap_promise(
       new cc::LatencyInfoSwapPromise(latency_info));
@@ -323,8 +314,6 @@ void Compositor::SetScaleAndSize(float scale, const gfx::Size& size_in_pixel) {
     size_ = size_in_pixel;
     host_->SetViewportSize(size_in_pixel);
     root_web_layer_->SetBounds(size_in_pixel);
-
-    next_draw_is_resize_ = true;
   }
   if (device_scale_factor_ != scale) {
     device_scale_factor_ = scale;