Add latency measurement system

content/browser/renderer_host/render_widget_host_unittest.cc

Index: content/browser/renderer_host/render_widget_host_unittest.cc
diff --git a/content/browser/renderer_host/render_widget_host_unittest.cc b/content/browser/renderer_host/render_widget_host_unittest.cc
index dc74728e57ef78468affda3f3f56b1123c0b2e45..a8f5e870fe008da48888013a148858a200eeeee9 100644
--- a/content/browser/renderer_host/render_widget_host_unittest.cc
+++ b/content/browser/renderer_host/render_widget_host_unittest.cc
@@ -641,6 +641,9 @@ class RenderWidgetHostTest : public testing::Test {
     PickleIterator iter(message);
     const char* data;
     int data_length;
+    int64 input_number;
+    if (!message.ReadInt64(&iter, &input_number))
+      return NULL;
     if (!message.ReadData(&iter, &data, &data_length))
       return NULL;
     return reinterpret_cast<const WebInputEvent*>(data);