Add Platform::physicalMemoryInBytes to WebKitPlatformSupportImpl.

BUG=312241

Review URL: https://codereview.chromium.org/50903003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233005 0039d316-1c4b-4281-b951-d872f2087c98

webkit/child/webkitplatformsupport_impl.cc

@@ -859,6 +859,10 @@ size_t WebKitPlatformSupportImpl::actualMemoryUsageMB() {
   return getMemoryUsageMB(true);
 }
 
+size_t WebKitPlatformSupportImpl::physicalMemoryMB() {
+  return static_cast<size_t>(base::SysInfo::AmountOfPhysicalMemoryMB());
+}
+
 void WebKitPlatformSupportImpl::startHeapProfiling(
   const WebKit::WebString& prefix) {
   // FIXME(morrita): Make this built on windows.

webkit/child/webkitplatformsupport_impl.h

@@ -49,6 +49,7 @@ class WEBKIT_CHILD_EXPORT WebKitPlatformSupportImpl :
       const WebKit::WebURL& url);
   virtual size_t memoryUsageMB();
   virtual size_t actualMemoryUsageMB();
+  virtual size_t physicalMemoryMB();
 
   virtual void startHeapProfiling(const WebKit::WebString& prefix);
   virtual void stopHeapProfiling() OVERRIDE;