Resize only the virtual viewport when the OSK triggers a resize.

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.annotation.TargetApi;
 import android.app.Activity;
 import android.app.SearchManager;
@@ skipping 1011 matching lines @@
 
     /**
      * @return Viewport height in physical pixels as set from onSizeChanged.
      */
     @CalledByNative
     public int getViewportHeightPix() {
         return mViewportHeightPix;
     }
 
     /**
+     * @return Viewport height when the OSK is hidden in physical pixels as set from onSizeChanged.
+     */
+    @CalledByNative
+    public int getViewportHeightWithOSKHiddenPix() {
+        return mViewportHeightPix + getContentViewClient().getSystemWindowInsetBottom();
+    }
+
+    /**
      * @return Width of underlying physical surface.
      */
     @CalledByNative
     private int getPhysicalBackingWidthPix() {
         return mPhysicalBackingWidthPix;
     }
 
     /**
      * @return Height of underlying physical surface.
      */
     @CalledByNative
     private int getPhysicalBackingHeightPix() {
         return mPhysicalBackingHeightPix;
     }
 
     /**
      * @return The amount that the viewport size given to Blink is shrunk by the URL-bar..
      */
     @CalledByNative
     public boolean doTopControlsShrinkBlinkSize() {
         return mTopControlsShrinkBlinkSize;
     }
 
     @CalledByNative
     public int getTopControlsHeightPix() {
         return mTopControlsHeightPix;
     }
 
     /**
+     * @return Current device scale factor (maps DIP pixels to physical pixels).
+     */
+    @VisibleForTesting
+    public float getDeviceScaleFactor() {
+        return mRenderCoordinates.getDeviceScaleFactor();
+    }
+
+    /**
+     * @return Current page scale factor (maps CSS pixels to DIP pixels).
+     */
+    @VisibleForTesting
+    public float getPageScaleFactor() {
+        return mRenderCoordinates.getPageScaleFactor();
+    }
+
+    /**
      * @see android.webkit.WebView#getContentHeight()
      */
     public float getContentHeightCss() {
         return mRenderCoordinates.getContentHeightCss();
     }
 
     /**
      * @see android.webkit.WebView#getContentWidth()
      */
     public float getContentWidthCss() {
@@ skipping 2261 matching lines @@
     private native void nativeSetTextTrackSettings(long nativeContentViewCoreImpl,
             boolean textTracksEnabled, String textTrackBackgroundColor, String textTrackFontFamily,
             String textTrackFontStyle, String textTrackFontVariant, String textTrackTextColor,
             String textTrackTextShadow, String textTrackTextSize);
 
     private native void nativeExtractSmartClipData(long nativeContentViewCoreImpl,
             int x, int y, int w, int h);
 
     private native void nativeSetBackgroundOpaque(long nativeContentViewCoreImpl, boolean opaque);
 }