Disable double tap zoom on mobile sites, to remove 300ms click delay

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

 // Copyright (c) 2013 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;
 
 /**
  * Cached copy of all positions and scales (CSS-to-DIP-to-physical pixels)
  * reported from the renderer.
  * Provides wrappers and a utility class to help with coordinate transforms on the client side.
@@ skipping 253 matching lines @@
      * @return Current device scale factor (maps DIP pixels to physical pixels).
      */
     public float getDeviceScaleFactor() { return mDeviceScaleFactor; }
 
     /**
      * @return True if the page doesn't allow zoom-in/zoom-out.
      */
     public boolean hasFixedPageScale() { return mMinPageScaleFactor == mMaxPageScaleFactor; }
 
     /**
+     * @return True if the page has a width=device-width or narrower viewport.
+     */
+    public boolean hasMobileViewport() {
+        float windowWidthDip = mPageScaleFactor * mLastFrameViewportWidthCss;
+        return mContentWidthCss <= windowWidthDip;
+    }
+
+    /**
      * @return Maximum possible horizontal scroll in physical pixels.
      */
     public float getMaxHorizontalScrollPix() {
         return getContentWidthPix() - getLastFrameViewportWidthPix();
     }
 
     /**
      * @return Maximum possible vertical scroll in physical pixels.
      */
     public float getMaxVerticalScrollPix() {
@@ skipping 35 matching lines @@
         return pix / (mDeviceScaleFactor * mPageScaleFactor);
     }
 
     /**
      * @return Local CSS converted to physical coordinates.
      */
     public float fromLocalCssToPix(float css) {
         return css * mPageScaleFactor * mDeviceScaleFactor;
     }
 }