[Android] Add a flag to disable the pull-to-refresh effect

content/browser/android/overscroll_controller_android.h

 // 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.
 
 #ifndef CONTENT_BROWSER_ANDROID_OVERSCROLL_CONTROLLER_ANDROID_H_
 #define CONTENT_BROWSER_ANDROID_OVERSCROLL_CONTROLLER_ANDROID_H_
 
 #include "base/time/time.h"
 #include "content/browser/android/overscroll_glow.h"
 #include "content/browser/android/overscroll_refresh.h"
@@ skipping 14 matching lines @@
 class WindowAndroidCompositor;
 }
 
 namespace content {
 
 struct DidOverscrollParams;
 
 // Glue class for handling all inputs into Android-specific overscroll effects,
 // both the passive overscroll glow and the active overscroll pull-to-refresh.
 // Note that all input coordinates (both for events and overscroll) are in DIPs.
-class OverscrollControllerAndroid : public OverscrollRefreshClient,
+class OverscrollControllerAndroid : public OverscrollGlowClient,
+                                    public OverscrollRefreshClient,
                                     public WebContentsObserver {
  public:
   OverscrollControllerAndroid(WebContents* web_contents,
                               ui::WindowAndroidCompositor* compositor,
                               float dpi_scale);
   virtual ~OverscrollControllerAndroid();
 
   // Returns true if |event| is consumed by an overscroll effect, in which
   // case it should cease propagation.
   bool WillHandleGestureEvent(const blink::WebGestureEvent& event);
@@ skipping 19 matching lines @@
 
  private:
   // WebContentsObserver implementation.
   void DidNavigateMainFrame(const LoadCommittedDetails& details,
                             const FrameNavigateParams& params) override;
 
   // OverscrollRefreshClient implementation.
   void TriggerRefresh() override;
   bool IsStillRefreshing() const override;
 
+  // OverscrollGlowClient implementation.
+  scoped_ptr<EdgeEffectBase> CreateEdgeEffect() override;
+
   void SetNeedsAnimate();
 
   ui::WindowAndroidCompositor* compositor_;
   const float dpi_scale_;
 
   bool enabled_;
 
   // TODO(jdduke): Factor out a common API from the two overscroll effects.
-  OverscrollGlow glow_effect_;
-  OverscrollRefresh refresh_effect_;
+  scoped_ptr<OverscrollGlow> glow_effect_;
+  scoped_ptr<OverscrollRefresh> refresh_effect_;
   bool triggered_refresh_active_;
 
   DISALLOW_COPY_AND_ASSIGN(OverscrollControllerAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_OVERSCROLL_CONTROLLER_ANDROID_H_