Add bitmap utils for Chrome on Android

ui/gfx/android/bitmap_android.h

Index: ui/gfx/android/bitmap_android.h
diff --git a/ui/gfx/android/bitmap_android.h b/ui/gfx/android/bitmap_android.h
new file mode 100644
index 0000000000000000000000000000000000000000..d23fcfe370afdbbc747b597813e23ec7aa115841
--- /dev/null
+++ b/ui/gfx/android/bitmap_android.h
@@ -0,0 +1,42 @@
+// 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_BITMAP_ANDROID_H_
+#define UI_GFX_BITMAP_ANDROID_H_
+
+#include "base/android/scoped_java_ref.h"
+#include "ui/gfx/size.h"
+
+class SkBitmap;
+
+using base::android::ScopedJavaLocalRef;

[sky, 2012/08/03 17:15:36]

No using in headers.

[Jesse Greenwald, 2012/08/03 20:10:06]

Done.

+
+namespace gfx {
+
+class AutoLockJavaBitmap {

[nilesh, 2012/08/03 04:52:36]

Please add a class level comment.

[sky, 2012/08/03 17:15:36]

Do you need to export this class?

[sky, 2012/08/03 17:15:36]

Filename should match class name.

[Jesse Greenwald, 2012/08/03 20:10:06]

Done.

+ public:
+  AutoLockJavaBitmap(jobject bitmap);

[sky, 2012/08/03 17:15:36]

explicit

[Jesse Greenwald, 2012/08/03 20:10:06]

Done.

+  ~AutoLockJavaBitmap();
+
+  void* pixels() const { return pixels_; }

[sky, 2012/08/03 17:15:36]

Generally its bad practice to return a non-const pointer from a const function.

[Jesse Greenwald, 2012/08/03 20:10:06]

Done - change it so that it's not a const function since callers could actually
modify the pixels.

+  gfx::Size size() const;

[sky, 2012/08/03 17:15:36]

unix_hacker_style function names are intended for trivial implementations that
typically inlined. All of these seem to have a non-trivial implementation.

[Jesse Greenwald, 2012/08/03 20:10:06]

Done.

+  // 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(AutoLockJavaBitmap);
+};
+
+base::android::ScopedJavaLocalRef<jobject> CreateJavaBitmap(
+    const gfx::Size& size);
+
+ScopedJavaLocalRef<jobject> ConvertToJavaBitmap(const SkBitmap* skbitmap);
+
+}  // namespace gfx
+
+#endif  // UI_GFX_BITMAP_ANDROID_H_