Support setting mouse cursor icon in Android N.

chrome/android/java/src/org/chromium/chrome/browser/widget/FadingBackgroundView.java

Index: chrome/android/java/src/org/chromium/chrome/browser/widget/FadingBackgroundView.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/widget/FadingBackgroundView.java b/chrome/android/java/src/org/chromium/chrome/browser/widget/FadingBackgroundView.java
index a65240b57bf636cfd12cb3f2da2e1f536c90982c..4d98e4d19f726f6a48364795db825afcd425d047 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/widget/FadingBackgroundView.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/widget/FadingBackgroundView.java
@@ -9,6 +9,7 @@ import android.animation.ObjectAnimator;
 import android.content.Context;
 import android.util.AttributeSet;
 import android.view.View;
+import android.view.ViewGroup.LayoutParams;
 
 import org.chromium.base.ObserverList;
 import org.chromium.chrome.browser.util.MathUtils;
@@ -98,7 +99,11 @@ public class FadingBackgroundView extends View implements View.OnClickListener {
 
     @Override
     public void setVisibility(int visibility) {
-        if (getAlpha() <= 0f && visibility == View.VISIBLE) return;
+        if (getAlpha() <= 0f && visibility == View.VISIBLE) {
+            changeHeight(0);
+            return;
+        }
+        changeHeight(visibility == View.VISIBLE ? LayoutParams.MATCH_PARENT : 0);
         super.setVisibility(visibility);
     }
 
@@ -164,6 +169,18 @@ public class FadingBackgroundView extends View implements View.OnClickListener {
         mOverlayAnimator.start();
     }
 
+    /**
+     * Change height of this view.
+     * @param height The height that it should be.
+     */
+    private void changeHeight(int height) {
+        LayoutParams params = getLayoutParams();
+        if (params != null && params.height != height) {
+            params.height = height;
+            setLayoutParams(params);
+        }
+    }
+
     /**
      * Adds an observer to this fading view.
      * @param observer The observer to be added.