Add a histogram for renderer memory usage.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index aaa236d920df661c4d199205c6cca91cca62a952..b6263c1f5244e6167283a919ad57ebdb8d88bf1d 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -483,6 +483,9 @@ 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";