Added UMA stat for tracking accidental navigations on double tap.

content/browser/android/content_view_core_impl.h

Index: content/browser/android/content_view_core_impl.h
diff --git a/content/browser/android/content_view_core_impl.h b/content/browser/android/content_view_core_impl.h
index f1e43cc8073f7f134327efec8b8e4ed4d2ea5aed..5072c0393ca6e4fe5adff824f65d1262bd45fcd4 100644
--- a/content/browser/android/content_view_core_impl.h
+++ b/content/browser/android/content_view_core_impl.h
@@ -222,6 +222,12 @@ class ContentViewCoreImpl : public ContentViewCore,
                                   jobject jsurface);
   void DetachExternalVideoSurface(JNIEnv* env, jobject obj, jint player_id);
   void SetAccessibilityEnabled(JNIEnv* env, jobject obj, bool enabled);
+  void SendActionAfterDoubleTapUma(JNIEnv* env,
+                                   jobject obj,
+                                   jint type,
+                                   jboolean has_delay,
+                                   jint count);
+  void SendSingleTapUma(JNIEnv* env, jobject obj, jint type, jint count);
 
   // --------------------------------------------------------------------------
   // Public methods that call to Java via JNI