Add a histogram for renderer memory usage.

content/public/common/content_switches.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.
 
 #include "content/public/common/content_switches.h"
 
 namespace switches {
 
 // By default, file:// URIs cannot read other file:// URIs. This is an
 // override for developers who need the old behavior for testing.
@@ skipping 465 matching lines @@
 // Load an NPAPI plugin from the specified path.
 const char kLoadPlugin[]                    = "load-plugin";
 
 // Sets the minimum log level. Valid values are from 0 to 3:
 // INFO = 0, WARNING = 1, LOG_ERROR = 2, LOG_FATAL = 3.
 const char kLoggingLevel[]                  = "log-level";
 
 // Make plugin processes log their sent and received messages to VLOG(1).
 const char kLogPluginMessages[]             = "log-plugin-messages";
 
+// Retrieve memory metrics.

[Charlie Reis, 2013/01/14 19:59:31]

Can you say a little more about what this means?

[marja, 2013/01/14 20:17:01]

Added:
// Sample memory usage with high frequency and store the results to the
// Renderer.Memory histogram. Used in memory tests.

+const char kMemoryMetrics[]                 = "memory-metrics";
+
 // Causes the process to run as a NativeClient broker
 // (used for launching NaCl loader processes on 64-bit Windows).
 const char kNaClBrokerProcess[]             = "nacl-broker";
 
 // Causes the process to run as a NativeClient loader.
 const char kNaClLoaderProcess[]             = "nacl-loader";
 
 // Don't send HTTP-Referer headers.
 const char kNoReferrers[]                   = "no-referrers";
 
@@ skipping 270 matching lines @@
     = "disable-fixed-position-creates-stacking-context";
 
 // Defer image decoding in WebKit until painting.
 const char kEnableDeferredImageDecoding[] = "enable-deferred-image-decoding";
 
 // Enables history navigation in response to horizontal overscroll.
 const char kEnableOverscrollHistoryNavigation[] =
     "enable-overscroll-history-navigation";
 
 }  // namespace switches