Mac: Support compositor in fullscreen windows.

chrome/browser/cocoa/fullscreen_window.mm

Index: chrome/browser/cocoa/fullscreen_window.mm
diff --git a/chrome/browser/cocoa/fullscreen_window.mm b/chrome/browser/cocoa/fullscreen_window.mm
index 15c2ee88aae369f603f6c66e91749424a2a74b0a..f4cfef6bc617480a21fe6f3506c1d4dee790eee9 100644
--- a/chrome/browser/cocoa/fullscreen_window.mm
+++ b/chrome/browser/cocoa/fullscreen_window.mm
@@ -103,4 +103,22 @@
   return [delegate themePatternPhase];
 }
 
+- (void)underlaySurfaceAdded {

[viettrungluu, 2010/08/26 03:12:53]

That's some pretty bad cutting-and-pasting going on there. Maybe we should
rename ChromeEventProcessingWindow, or add something else into (the middle of)
the class hierarchy, where things like this can go?

+  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];
+}
+
 @end