[WebView] Add a new flushVisualState API to AwContents.

android_webview/javatests/src/org/chromium/android_webview/test/util/GraphicsTestUtils.java

Index: android_webview/javatests/src/org/chromium/android_webview/test/util/GraphicsTestUtils.java
diff --git a/android_webview/javatests/src/org/chromium/android_webview/test/util/GraphicsTestUtils.java b/android_webview/javatests/src/org/chromium/android_webview/test/util/GraphicsTestUtils.java
new file mode 100644
index 0000000000000000000000000000000000000000..95c6758ad9675603cc280f74abd754a067a95d0c
--- /dev/null
+++ b/android_webview/javatests/src/org/chromium/android_webview/test/util/GraphicsTestUtils.java
@@ -0,0 +1,52 @@
+// Copyright 2015 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.android_webview.test.util;
+
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+
+import org.chromium.android_webview.AwContents;
+
+/**
+ * Graphics-related test utils.
+ */
+public class GraphicsTestUtils {
+    /**
+     * Draws the supplied {@link AwContents} into the returned {@link Bitmap}.
+     *
+     * @param awContents The contents to draw
+     * @param width The width of the bitmap
+     * @param height The height of the bitmap
+     */
+    public static Bitmap drawAwContents(AwContents awContents, int width, int height) {
+        return doDrawAwContents(awContents, width, height, null, null);
+    }
+
+    /**
+     * Draws the supplied {@link AwContents} after applying a translate into the returned
+     * {@link Bitmap}.
+     *
+     * @param awContents The contents to draw
+     * @param width The width of the bitmap
+     * @param height The height of the bitmap
+     * @param dx The distance to translate in X
+     * @param dy The distance to translate in Y
+     */
+    public static Bitmap drawAwContents(
+            AwContents awContents, int width, int height, float dx, float dy) {
+        return doDrawAwContents(awContents, width, height, dx, dy);
+    }
+
+    private static Bitmap doDrawAwContents(
+            AwContents awContents, int width, int height, Float dx, Float dy) {
+        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
+        Canvas canvas = new Canvas(bitmap);
+        if (dx != null && dy != null) {
+            canvas.translate(dx, dy);
+        }
+        awContents.onDraw(canvas);
+        return bitmap;
+    }
+}