Mac: Clean up visibility state tracking

content/browser/renderer_host/browser_compositor_view_mac.mm

 // Copyright 2014 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/browser_compositor_view_mac.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 373 matching lines @@
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DelegatedFrameHost, public:
 
 ui::Layer* BrowserCompositorMac::DelegatedFrameHostGetLayer() const {
   return root_layer_.get();
 }
 
 bool BrowserCompositorMac::DelegatedFrameHostIsVisible() const {
-  // TODO(ccameron): This should return the same value as
-  // |render_widget_host_is_hidden_|, rather than going back to the
-  // RenderWidgetHostImpl.
-  return client_->BrowserCompositorMacIsVisible();
+  return state_ == HasAttachedCompositor;
 }
 
 SkColor BrowserCompositorMac::DelegatedFrameHostGetGutterColor(
     SkColor color) const {
   return client_->BrowserCompositorMacGetGutterColor(color);
 }
 
 gfx::Size BrowserCompositorMac::DelegatedFrameHostDesiredSizeInDIP() const {
   NSRect bounds = [client_->BrowserCompositorMacGetNSView() bounds];
   return gfx::Size(bounds.size.width, bounds.size.height);
@@ skipping 57 matching lines @@
 
 const cc::BeginFrameArgs& BrowserCompositorMac::LastUsedBeginFrameArgs() const {
   return last_begin_frame_args_;
 }
 
 void BrowserCompositorMac::OnBeginFrameSourcePausedChanged(bool paused) {
   // Only used on Android WebView.
 }
 
 }  // namespace content