cc: Guard overdraw metrics behind the --trace-overdraw command-line flag.

content/browser/renderer_host/render_process_host_impl.cc

 // 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 847 matching lines @@
     switches::kV,
     switches::kVideoThreads,
     switches::kVModule,
     switches::kWebCoreLogChannels,
     cc::switches::kBackgroundColorInsteadOfCheckerboard,
     cc::switches::kDisableThreadedAnimation,
     cc::switches::kEnablePartialSwap,
     cc::switches::kEnablePerTilePainting,
     cc::switches::kEnablePinchInCompositor,
     cc::switches::kJankInsteadOfCheckerboard,
+    cc::switches::kTraceOverdraw,
   };
   renderer_cmd->CopySwitchesFrom(browser_cmd, kSwitchNames,
                                  arraysize(kSwitchNames));
 
   // Disable databases in incognito mode.
   if (GetBrowserContext()->IsOffTheRecord() &&
       !browser_cmd.HasSwitch(switches::kDisableDatabases)) {
     renderer_cmd->AppendSwitch(switches::kDisableDatabases);
 #if defined(OS_ANDROID)
     renderer_cmd->AppendSwitch(switches::kDisableMediaHistoryLogging);
@@ skipping 719 matching lines @@
       int32 gpu_process_host_id) {
   TRACE_EVENT0("renderer_host",
                "RenderWidgetHostImpl::OnCompositorSurfaceBuffersSwappedNoHost");
   RenderWidgetHostImpl::AcknowledgeBufferPresent(route_id,
                                                  gpu_process_host_id,
                                                  false,
                                                  0);
 }
 
 }  // namespace content