Add bitmap utils for Chrome on Android

ui/gfx/android/java_bitmap.h

+// Copyright (c) 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.
+
+#ifndef UI_GFX_ANDROID_JAVA_BITMAP_H_
+#define UI_GFX_ANDROID_JAVA_BITMAP_H_
+
+#include "base/android/scoped_java_ref.h"
+#include "ui/gfx/size.h"
+
+class SkBitmap;
+
+namespace gfx {
+
+// This class wraps a JNI AndroidBitmap object to make it easier to use. It
+// handles locking and unlocking of the underlying pixels, along with wrapping
+// various JNI methods.
+UI_EXPORT class JavaBitmap {
+ public:
+  explicit JavaBitmap(jobject bitmap);
+  ~JavaBitmap();
+
+  void* pixels() { return pixels_; }
+  gfx::Size Size() const;
+  // Formats are in android/bitmap.h; e.g. ANDROID_BITMAP_FORMAT_RGBA_8888
+  int Format() const;
+  uint32_t Stride() const;
+
+ private:
+  jobject bitmap_;
+  void* pixels_;
+
+  DISALLOW_COPY_AND_ASSIGN(JavaBitmap);
+};
+
+base::android::ScopedJavaLocalRef<jobject> CreateJavaBitmap(
+    const gfx::Size& size);
+
+base::android::ScopedJavaLocalRef<jobject> ConvertToJavaBitmap(
+    const SkBitmap* skbitmap);
+
+}  // namespace gfx
+
+#endif  // UI_GFX_ANDROID_JAVA_BITMAP_H_