Mac: Well-behaved accelerated plugins, actual fix

chrome/browser/cocoa/chrome_browser_window.mm

 // Copyright (c) 2009 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.
 
 #import "chrome/browser/cocoa/chrome_browser_window.h"
 
 #include "base/logging.h"
 #include "chrome/browser/browser_theme_provider.h"
 #import "chrome/browser/cocoa/browser_frame_view.h"
 #import "chrome/browser/cocoa/browser_window_controller.h"
@@ skipping 225 matching lines @@
     if (newEntered != entered_) {
       // Buttons have moved, so update button state.
       entered_ = newEntered;
       [closeButton_ setNeedsDisplay];
       [zoomButton_ setNeedsDisplay];
       [miniaturizeButton_ setNeedsDisplay];
     }
   }
 }
 
+- (void)underlaySurfaceAdded {
+  DCHECK_GE(underlaySurfaceCount_, 0);
+  ++underlaySurfaceCount_;
+
+  // We're having the OpenGL surface render under the window, so the window
+  // needs to be not opaque.
+  if (underlaySurfaceCount_ == 1)
+    [self setOpaque:NO];
+}
+
+- (void)underlaySurfaceRemoved {
+  --underlaySurfaceCount_;
+  DCHECK_GE(underlaySurfaceCount_, 0);
+
+  if (underlaySurfaceCount_ == 0)
+    [self setOpaque:YES];
+}
+
 - (void)windowMainStatusChanged {
   [closeButton_ setNeedsDisplay];
   [zoomButton_ setNeedsDisplay];
   [miniaturizeButton_ setNeedsDisplay];
   NSView* frameView = [self frameView];
   NSView* contentView = [self contentView];
   NSRect updateRect = [frameView frame];
   NSRect contentRect = [contentView frame];
   CGFloat tabStripHeight = [TabStripController defaultTabHeight];
   updateRect.size.height -= NSHeight(contentRect) - tabStripHeight;
@@ skipping 106 matching lines @@
 }
 
 - (NSPoint)themePatternPhase {
   id delegate = [self delegate];
   if (![delegate respondsToSelector:@selector(themePatternPhase)])
     return NSMakePoint(0, 0);
   return [delegate themePatternPhase];
 }
 
 @end