Support InputRouter recycling

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

 // Copyright 2012 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.
 
 package org.chromium.content.browser;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.app.SearchManager;
 import android.content.ClipboardManager;
@@ skipping 616 matching lines @@
         mImeAdapter = createImeAdapter(mContext);
 
         mAccessibilityInjector = AccessibilityInjector.newInstance(this);
 
         mWebContentsObserver = new WebContentsObserverAndroid(mWebContents) {
             @Override
             public void didNavigateMainFrame(String url, String baseUrl,
                     boolean isNavigationToDifferentPage, boolean isFragmentNavigation) {
                 if (!isNavigationToDifferentPage) return;
                 hidePopupsAndClearSelection();
-                resetScrollInProgress();
                 resetGestureDetection();
             }
 
             @Override
             public void renderProcessGone(boolean wasOomProtected) {
                 hidePopupsAndClearSelection();
                 resetScrollInProgress();
                 // No need to reset gesture detection as the detector will have
                 // been destroyed in the RenderWidgetHostView.
             }
@@ skipping 612 matching lines @@
         if (mActionMode != null) {
             mActionMode.finish();
             mActionMode = null;
         }
     }
 
     public boolean isSelectActionBarShowing() {
         return mActionMode != null;
     }
 
     private void resetGestureDetection() {

[jdduke (slow), 2014/12/20 01:12:17]

Should probably rename this to |resetInputStream()|.

-        if (mNativeContentViewCore == 0) return;
-        nativeResetGestureDetection(mNativeContentViewCore);
+        if (mNativeContentViewCore != 0) nativeResetGestureDetection(mNativeContentViewCore);
+        resetScrollInProgress();
     }
 
     /**
      * @see View#onAttachedToWindow()
      */
     @SuppressWarnings("javadoc")
     public void onAttachedToWindow() {
         setAccessibilityState(mAccessibilityManager.isEnabled());
         restoreSelectionPopupsIfNecessary();
         ScreenOrientationListener.getInstance().addObserver(this, mContext);
@@ skipping 1648 matching lines @@
     private native void nativeWasResized(long nativeContentViewCoreImpl);
 
     private native void nativeSetAccessibilityEnabled(
             long nativeContentViewCoreImpl, boolean enabled);
 
     private native void nativeExtractSmartClipData(long nativeContentViewCoreImpl,
             int x, int y, int w, int h);
 
     private native void nativeSetBackgroundOpaque(long nativeContentViewCoreImpl, boolean opaque);
 }