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diff --git a/webkit/plugins/ppapi/ppb_image_data_impl.h b/webkit/plugins/ppapi/ppb_image_data_impl.h
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+++ b/webkit/plugins/ppapi/ppb_image_data_impl.h
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+// Copyright (c) 2010 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 WEBKIT_PLUGINS_PPAPI_PPB_IMAGE_DATA_IMPL_H_
+#define WEBKIT_PLUGINS_PPAPI_PPB_IMAGE_DATA_IMPL_H_
+
+#include "base/basictypes.h"
+#include "base/scoped_ptr.h"
+#include "ppapi/c/ppb_image_data.h"
+#include "webkit/plugins/ppapi/plugin_delegate.h"
+#include "webkit/plugins/ppapi/resource.h"
+
+namespace skia {
+class PlatformCanvas;
+}
+
+struct PPB_ImageDataTrusted;
+class SkBitmap;
+
+namespace webkit {
+namespace ppapi {
+
+class PPB_ImageData_Impl : public Resource {
+ public:
+  explicit PPB_ImageData_Impl(PluginModule* module);
+  virtual ~PPB_ImageData_Impl();
+
+  int width() const { return width_; }
+  int height() const { return height_; }
+
+  // Returns the image format.
+  PP_ImageDataFormat format() const { return format_; }
+
+  // Returns true if this image is mapped. False means that the image is either
+  // invalid or not mapped. See ImageDataAutoMapper below.
+  bool is_mapped() const { return !!mapped_canvas_.get(); }
+
+  PluginDelegate::PlatformImage2D* platform_image() const {
+    return platform_image_.get();
+  }
+
+  // Returns a pointer to the interface implementing PPB_ImageData that is
+  // exposed to the plugin.
+  static const PPB_ImageData* GetInterface();
+  static const PPB_ImageDataTrusted* GetTrustedInterface();
+
+  // Returns the image data format used by the browser. If the plugin uses the
+  // same format, there is no conversion. Otherwise the browser will be in
+  // charge of converting from a supported format to its native format.
+  static PP_ImageDataFormat GetNativeImageDataFormat();
+
+  // Returns true if the format is supported by the browser.
+  static bool IsImageDataFormatSupported(PP_ImageDataFormat format);
+
+  // Resource overrides.
+  virtual PPB_ImageData_Impl* AsPPB_ImageData_Impl();
+
+  // PPB_ImageData implementation.
+  bool Init(PP_ImageDataFormat format,
+            int width, int height,
+            bool init_to_zero);
+  void Describe(PP_ImageDataDesc* desc) const;
+  void* Map();
+  void Unmap();
+
+  // PPB_ImageDataTrusted implementation.
+  int GetSharedMemoryHandle(uint32* byte_count) const;
+
+  // The mapped bitmap and canvas will be NULL if the image is not mapped.
+  skia::PlatformCanvas* mapped_canvas() const { return mapped_canvas_.get(); }
+  const SkBitmap* GetMappedBitmap() const;
+
+  // Swaps the guts of this image data with another.
+  void Swap(PPB_ImageData_Impl* other);
+
+ private:
+  // This will be NULL before initialization, and if this PPB_ImageData_Impl is
+  // swapped with another.
+  scoped_ptr<PluginDelegate::PlatformImage2D> platform_image_;
+
+  // When the device is mapped, this is the image. Null when umapped.
+  scoped_ptr<skia::PlatformCanvas> mapped_canvas_;
+
+  PP_ImageDataFormat format_;
+  int width_;
+  int height_;
+
+  DISALLOW_COPY_AND_ASSIGN(PPB_ImageData_Impl);
+};
+
+// Manages mapping an image resource if necessary. Use this to ensure the
+// image is mapped. The destructor will put the image back into the previous
+// state. You must check is_valid() to make sure the image was successfully
+// mapped before using it.
+//
+// Example:
+//   ImageDataAutoMapper mapper(image_data);
+//   if (!mapper.is_valid())
+//     return utter_failure;
+//   image_data->mapped_canvas()->blah();  // Guaranteed valid.
+class ImageDataAutoMapper {
+ public:
+  ImageDataAutoMapper(PPB_ImageData_Impl* image_data)
+        : image_data_(image_data) {
+    if (image_data_->is_mapped()) {
+      is_valid_ = true;
+      needs_unmap_ = false;
+    } else {
+      is_valid_ = needs_unmap_ = !!image_data_->Map();
+    }
+  }
+
+  ~ImageDataAutoMapper() {
+    if (needs_unmap_)
+      image_data_->Unmap();
+  }
+
+  // Check this to see if the image was successfully mapped. If this is false,
+  // the image could not be mapped and is unusable.
+  bool is_valid() const { return is_valid_; }
+
+ private:
+  PPB_ImageData_Impl* image_data_;
+  bool is_valid_;
+  bool needs_unmap_;
+
+  DISALLOW_COPY_AND_ASSIGN(ImageDataAutoMapper);
+};
+
+}  // namespace ppapi
+}  // namespace webkit
+
+#endif  // WEBKIT_PLUGINS_PPAPI_PPB_IMAGE_DATA_IMPL_H_