Allow MessageFilters to restrict listening to specific message classes

content/browser/vibration/vibration_message_filter.cc

Index: content/browser/vibration/vibration_message_filter.cc
diff --git a/content/browser/vibration/vibration_message_filter.cc b/content/browser/vibration/vibration_message_filter.cc
index 99811a976dbcd360facac3f706487beb98e2acf4..955104248cab1fbac64b86caf3330aeb6bb988d7 100644
--- a/content/browser/vibration/vibration_message_filter.cc
+++ b/content/browser/vibration/vibration_message_filter.cc
@@ -14,11 +14,20 @@
 #include "third_party/WebKit/public/platform/WebVibration.h"
 
 namespace content {
+namespace {
 
 // Minimum duration of a vibration is 1 millisecond.
 const int64 kMinimumVibrationDurationMs = 1;
 
-VibrationMessageFilter::VibrationMessageFilter() {
+const uint32 kFilteredMessageClasses[] = {
+  ViewMsgStart
+};
+
+}  // namespace
+
+VibrationMessageFilter::VibrationMessageFilter()
+    : BrowserMessageFilter(
+          kFilteredMessageClasses, arraysize(kFilteredMessageClasses)) {
   provider_.reset(GetContentClient()->browser()->OverrideVibrationProvider());
   if (!provider_.get())
     provider_.reset(CreateProvider());