Introduce "--enable-memory-info" command-line flag to enable reporting

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index f0e6950e0b5f21a19ad56191f8cf8e79bc32e490..49e35fa4b92b1fdabec04e12ab099c029d74fbdb 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -339,6 +339,9 @@ const char kEnableGPURendering[]            = "enable-gpu-rendering";
 // builds.
 const char kEnableLogging[]                 = "enable-logging";
 
+// Allows reporting memory info (JS heap size) to page.
+const char kEnableMemoryInfo[]              = "enable-memory-info";
+
 // On Windows, converts the page to the currently-installed monitor profile.
 // This does NOT enable color management for images. The source is still
 // assumed to be sRGB.