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

mojo/runner/switches.cc

Index: mojo/runner/switches.cc
diff --git a/mojo/runner/switches.cc b/mojo/runner/switches.cc
index 2855d3cae87b409ea80d2e6ead7cd4e91f8d73e3..52e8fd5912687481530d54fb1a6ea2337ce56a67 100644
--- a/mojo/runner/switches.cc
+++ b/mojo/runner/switches.cc
@@ -40,6 +40,12 @@ const char kHelp[] = "help";
 // 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";