Add stats collection for telemetry startup.warm.blank_page test.

mojo/runner/switches.cc

 // Copyright 2013 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 "mojo/runner/switches.h"
 
 #include "base/basictypes.h"
 
 namespace switches {
 
@@ skipping 22 matching lines @@
 // --force-in-process=mojo:native_viewport_service,mojo:network_service
 const char kForceInProcess[] = "force-in-process";
 
 // Print the usage message and exit.
 const char kHelp[] = "help";
 
 // Specify origin to map to base url. See url_resolver.cc for details.
 // Can be used multiple times.
 const char kMapOrigin[] = "map-origin";
 
+// Specifies if the |StatsCollectionController| needs to be bound in html pages.
+// This binding happens on per-frame basis and hence can potentially be a
+// performance bottleneck. One should only enable it when running a test that
+// needs to access the provided statistics.
+const char kStatsCollectionController[] = "enable-stats-collection-bindings";

[yzshen1, 2015/08/13 15:59:12]

nit: Variable name should match the value.

[msw, 2015/08/14 23:20:35]

Done.

+
 // Starts tracing when the shell starts up, saving a trace file on disk after 5
 // seconds or when the shell exits.
 const char kTraceStartup[] = "trace-startup";
 
 // Specifies a set of mappings to apply when resolving URLs. The value is a set
 // of comma-separated mappings, where each mapping consists of a pair of URLs
 // giving the to/from URLs to map. For example, 'a=b,c=d' contains two mappings,
 // the first maps 'a' to 'b' and the second 'c' to 'd'.
 const char kURLMappings[] = "url-mappings";
 
 // When this is set, we create a temporary user data dir for the process, and
 // add a flag so kUserDataDir points to it.
 const char kUseTemporaryUserDataDir[] = "use-temporary-user-data-dir";
 
 // Specifies the user data directory. This is the one directory which stores
 // all persistent data.
 const char kUserDataDir[] = "user-data-dir";
 
 }  // namespace switches