Add User Actions and adding more details to UMA metrics for overscroll navigation

content/browser/web_contents/aura/overscroll_window_delegate_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/web_contents/aura/overscroll_window_delegate.h"
 
 #include "base/macros.h"
 #include "content/browser/renderer_host/overscroll_controller_delegate.h"
 #include "content/public/browser/overscroll_configuration.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 72 matching lines @@
 
   bool OnOverscrollUpdate(float delta_x, float delta_y) override {
     return true;
   }
 
   void OnOverscrollComplete(OverscrollMode overscroll_mode) override {
     overscroll_complete_ = true;
   }
 
   void OnOverscrollModeChange(OverscrollMode old_mode,
-                              OverscrollMode new_mode) override {
+                              OverscrollMode new_mode,
+                              OverscrollSource source) override {
     mode_changed_ = true;
     current_mode_ = new_mode;
     if (current_mode_ != OVERSCROLL_NONE)
       overscroll_started_ = true;
   }
 
   // Window in which the overscroll window delegate is installed.
   std::unique_ptr<aura::Window> window_;
 
   // State flags.
@@ skipping 139 matching lines @@
   EXPECT_EQ(current_mode(), OVERSCROLL_NONE);
   EXPECT_FALSE(overscroll_complete());
 
   // We should be able to restart the overscroll without lifting the finger.
   generator.MoveTouch(gfx::Point(touch_x + touch_start_threshold() + 1, 0));
   EXPECT_EQ(current_mode(), OVERSCROLL_EAST);
   EXPECT_FALSE(overscroll_complete());
 }
 
 }  // namespace content