Mac fullscreen low power: Ignore WasOccluded by low power window

content/browser/renderer_host/render_widget_host_view_mac.mm

 // 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 "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 #include <stdint.h>
@@ skipping 891 matching lines @@
 
   // If there is not a frame being currently drawn, kick one, so that the below
   // pause will have a frame to wait on.
   render_widget_host_->ScheduleComposite();
   PauseForPendingResizeOrRepaintsAndDraw();
 }
 
 void RenderWidgetHostViewMac::Hide() {
   ScopedCAActionDisabler disabler;
   [cocoa_view_ setHidden:YES];
-  WasOccluded();
+  if (!render_widget_host_->is_hidden()) {
+    // Note that the following call to WasHidden() can trigger thumbnail
+    // generation on behalf of the NTP, and that cannot succeed if the browser
+    // compositor view has been suspended. Therefore these two statements must
+    // occur in this specific order. However, because thumbnail generation is
+    // asychronous, that operation won't run before
+    // SuspendBrowserCompositorView()
+    // completes. As a result you won't get a thumbnail for the page unless you
+    // execute these two statements in this specific order.
+    render_widget_host_->WasHidden();
+    SuspendBrowserCompositorView();
+  }
   DestroySuspendedBrowserCompositorViewIfNeeded();
 }
 
 void RenderWidgetHostViewMac::WasUnOccluded() {
   if (!render_widget_host_->is_hidden())
     return;
 
   ui::LatencyInfo renderer_latency_info;
   renderer_latency_info.AddLatencyNumber(
       ui::TAB_SHOW_COMPONENT,
       render_widget_host_->GetLatencyComponentId(),
       0);
   render_widget_host_->WasShown(renderer_latency_info);
 }
 
 void RenderWidgetHostViewMac::WasOccluded() {
   if (render_widget_host_->is_hidden())
     return;
 
-  // Note that the following call to WasHidden() can trigger thumbnail
-  // generation on behalf of the NTP, and that cannot succeed if the browser
-  // compositor view has been suspended. Therefore these two statements must
-  // occur in this specific order. However, because thumbnail generation is
-  // asychronous, that operation won't run before SuspendBrowserCompositorView()
-  // completes. As a result you won't get a thumbnail for the page unless you
-  // execute these two statements in this specific order.
+  // Ignore occlusion when in fullscreen low power mode, because the occlusion
+  // is likely coming from the fullscreen low power window.
+  if (browser_compositor_) {
+    if (browser_compositor_->accelerated_widget_mac()
+            ->MightBeInFullscreenLowPowerMode())
+      return;
+  }
+
+  // Note the importance of ordering of these calls is the same in the Hide
+  // function.
   render_widget_host_->WasHidden();
   SuspendBrowserCompositorView();
 }
 
 void RenderWidgetHostViewMac::SetSize(const gfx::Size& size) {
   gfx::Rect rect = GetViewBounds();
   rect.set_size(size);
   SetBounds(rect);
 }
 
@@ skipping 2487 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end