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

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

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index e6eb23a536823ecf8c691e22078af60c14dc27e6..a9b7546693616cd251694264d7ce5d180d06e1a6 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -464,6 +464,7 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
     private int mPhysicalBackingHeightPix;
     private int mTopControlsHeightPix;
     private boolean mTopControlsShrinkBlinkSize;
+    private Rect mWindowInsets;

[aelias_OOO_until_Jul13, 2016/02/24 02:43:59]

As I mentioned in #31, I'd like this to be stored in InsetConsumerView instead.

[ymalik, 2016/03/03 02:10:18]

Done.

 
     // Cached copy of all positions and scales as reported by the renderer.
     private final RenderCoordinates mRenderCoordinates;
@@ -601,6 +602,8 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
         mGestureStateListenersIterator = mGestureStateListeners.rewindableIterator();
 
         mContainerViewObservers = new ObserverList<ContainerViewObserver>();
+
+        mWindowInsets = new Rect();
     }
 
     /**
@@ -619,6 +622,25 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
     }
 
     /**
+     * @return The system window insets (from OSK, status bar, etc).
+     */
+    private Rect getWindowInsets() {
+        return mWindowInsets != null ? mWindowInsets : new Rect();
+    }
+
+    /**
+     * Set the window insets Rect to the specified values.
+     *
+     * @param left The left window inset
+     * @param top The top window inset.
+     * @param right The right window inset.
+     * @param bottom The bottom window inset.
+     */
+    public void setWindowInsets(int left, int top, int right, int bottom) {
+        mWindowInsets.set(left, top, right, bottom);
+    }
+
+    /**
      * @return The WebContents currently being rendered.
      */
     public WebContents getWebContents() {
@@ -1017,6 +1039,14 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
     }
 
     /**
+     * @return Viewport height when the OSK is hidden in physical pixels as set from onSizeChanged.
+     */
+    @CalledByNative
+    public int getViewportHeightWithOSKHiddenPix() {
+        return mViewportHeightPix + getWindowInsets().bottom;
+    }
+
+    /**
      * @return Width of underlying physical surface.
      */
     @CalledByNative