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

cc/settings.cc

 // Copyright 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 "base/command_line.h"
 #include "cc/settings.h"
 #include "cc/switches.h"
 
 namespace {
 static bool s_settingsInitialized = false;
 
 static bool s_perTilePaintingEnabled = false;
 static bool s_partialSwapEnabled = false;
 static bool s_acceleratedAnimationEnabled = false;
 static bool s_pageScalePinchZoomEnabled = false;
 static bool s_jankInsteadOfCheckerboard = false;
 static bool s_backgroundColorInsteadOfCheckerboard = false;
+static bool s_traceOverdraw = false;
 
 void reset()
 {
     s_settingsInitialized = true;
 
     s_perTilePaintingEnabled = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kEnablePerTilePainting);
     s_partialSwapEnabled = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kEnablePartialSwap);
     s_acceleratedAnimationEnabled = !CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kDisableThreadedAnimation);
     s_pageScalePinchZoomEnabled = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kEnablePinchInCompositor);
     s_jankInsteadOfCheckerboard = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kJankInsteadOfCheckerboard);
     s_backgroundColorInsteadOfCheckerboard = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kBackgroundColorInsteadOfCheckerboard);
+    s_traceOverdraw = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kTraceOverdraw);
 }
 
 }
 
 namespace cc {
 
 bool Settings::perTilePaintingEnabled()
 {
     if (!s_settingsInitialized)
         reset();
@@ skipping 28 matching lines @@
     return s_jankInsteadOfCheckerboard;
 }
 
 bool Settings::backgroundColorInsteadOfCheckerboard()
 {
     if (!s_settingsInitialized)
         reset();
     return s_backgroundColorInsteadOfCheckerboard;
 }
 
+bool Settings::traceOverdraw()
+{
+    if (!s_settingsInitialized)
+        reset();
+    return s_traceOverdraw;
+}
+
 void Settings::resetForTest()
 {
     reset();
 }
 
 void Settings::setPartialSwapEnabled(bool enabled)
 {
     if (!s_settingsInitialized)
         reset();
     s_partialSwapEnabled = enabled;
@@ skipping 14 matching lines @@
 }
 
 void Settings::setPageScalePinchZoomEnabled(bool enabled)
 {
     if (!s_settingsInitialized)
         reset();
     s_pageScalePinchZoomEnabled = enabled;
 }
 
 }  // namespace cc