[Android] Add UMA for pull-to-refresh activation

content/browser/android/overscroll_controller_android.cc

 // Copyright 2014 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/android/overscroll_controller_android.h"
 
 #include "base/android/build_info.h"
 #include "base/command_line.h"
 #include "cc/layers/layer.h"
 #include "cc/output/compositor_frame_metadata.h"
 #include "content/browser/android/edge_effect.h"
 #include "content/browser/android/edge_effect_l.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/input/did_overscroll_params.h"
 #include "content/public/browser/navigation_controller.h"
+#include "content/public/browser/user_metrics.h"
 #include "content/public/common/content_switches.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/android/resources/resource_manager.h"
 #include "ui/base/android/window_android_compositor.h"
 
 namespace content {
 namespace {
 
 // Used for conditional creation of EdgeEffect types for the overscroll glow.
 const int kAndroidLSDKVersion = 21;
@@ skipping 244 matching lines @@
   if (is_fullscreen_)
     refresh_effect_->ReleaseWithoutActivation();
 }
 
 void OverscrollControllerAndroid::TriggerRefresh() {
   triggered_refresh_active_ = false;
   if (!web_contents())
     return;
 
   triggered_refresh_active_ = true;
+  RecordAction(base::UserMetricsAction("MobilePullGestureReload"));
   web_contents()->GetController().Reload(true);
 }
 
 bool OverscrollControllerAndroid::IsStillRefreshing() const {
   return triggered_refresh_active_;
 }
 
 scoped_ptr<EdgeEffectBase> OverscrollControllerAndroid::CreateEdgeEffect() {
   return CreateGlowEdgeEffect(&compositor_->GetResourceManager(), dpi_scale_);
 }
 
 void OverscrollControllerAndroid::SetNeedsAnimate() {
   compositor_->SetNeedsAnimate();
 }
 
 }  // namespace content