Adds support for capturing a sub rect of the compositing surface.

chrome/android/java/src/org/chromium/chrome/browser/NativePage.java

Index: chrome/android/java/src/org/chromium/chrome/browser/NativePage.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/NativePage.java b/chrome/android/java/src/org/chromium/chrome/browser/NativePage.java
index c225da8d83c4603ddf4aa6c2c0a6f837b758ece5..7ad385040867dfb74d221de87ee82e79335677c8 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/NativePage.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/NativePage.java
@@ -4,6 +4,8 @@
 
 package org.chromium.chrome.browser;
 
+import android.graphics.Bitmap;
+
 import org.chromium.content.browser.PageInfo;
 
 /**
@@ -29,4 +31,14 @@ public interface NativePage extends PageInfo {
      * Updates the native page based on the given url.
      */
     public void updateForUrl(String url);
+
+    /**
+     * @return An unscaled screenshot of the page.
+     */
+    Bitmap getBitmap();
+
+    /**
+     * @return A screenshot of the page scaled to the specified size.
+     */
+    Bitmap getBitmap(int width, int height);
 }