Implement HiDPI support in Pepper dev interface

ppapi/c/private/ppb_graphics_2d_private.h

Index: ppapi/c/private/ppb_graphics_2d_private.h
diff --git a/ppapi/c/private/ppb_graphics_2d_private.h b/ppapi/c/private/ppb_graphics_2d_private.h
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+++ b/ppapi/c/private/ppb_graphics_2d_private.h
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+/* 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.
+ */
+
+/* From private/ppb_graphics_2d_private.idl,
+ *   modified Thu Jun 14 16:30:59 2012.
+ */
+
+#ifndef PPAPI_C_PRIVATE_PPB_GRAPHICS_2D_PRIVATE_H_
+#define PPAPI_C_PRIVATE_PPB_GRAPHICS_2D_PRIVATE_H_
+
+#include "ppapi/c/pp_bool.h"
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/pp_macros.h"
+#include "ppapi/c/pp_resource.h"
+#include "ppapi/c/pp_size.h"
+#include "ppapi/c/pp_stdint.h"
+
+#define PPB_GRAPHICS2D_PRIVATE_INTERFACE_0_1 "PPB_Graphics2D_Private;0.1"
+#define PPB_GRAPHICS2D_PRIVATE_INTERFACE PPB_GRAPHICS2D_PRIVATE_INTERFACE_0_1
+
+/**
+ * @file
+ * This file contains the <code>PPB_Graphics2D_Private</code> interface. */
+
+
+/**
+ * @addtogroup Interfaces
+ * @{
+ */
+/* PPB_Graphics2D_Private interface */
+struct PPB_Graphics2D_Private_0_1 {
+  /**
+   * Create() creates a 2D graphics context. The returned graphics context will
+   * not be bound to the module instance on creation (call BindGraphics() on
+   * the module instance to bind the returned graphics context to the module
+   * instance).
+   *
+   * @param[in] instance The module instance.
+   * @param[in] size The size of the graphic context.
+   * @param[in] is_always_opaque Set the <code>is_always_opaque</code> flag to
+   * <code>PP_TRUE</code> if you know that you will be painting only opaque
+   * data to this context. This option will disable blending when compositing
+   * the module with the web page, which might give higher performance on some
+   * computers.
+   *
+   * If you set <code>is_always_opaque</code>, your alpha channel should always
+   * be set to 0xFF or there may be painting artifacts. The alpha values
+   * overwrite the destination alpha values without blending when
+   * <code>is_always_opaque</code> is true.
+   *
+   * @param[in] scale The scaling factor between pixels in this context and
+   * DIPs. For rendering at device resolution, this will typically be equal to
+   * the device scale of the view resource passed to DidChangeView.
+   * For example, if the view resource passed to DidChangeView has a rectangle
+   * of (w=200, h=100) and a device scale of 2.0, one would call Create with a
+   * size of (w=400, h=200) and a scaler of 2.0 then treat each pixel in the
+   * context as a single device pixel.
+   *
+   * @return A <code>PP_Resource</code> containing the 2D graphics context if
+   * successful or 0 if unsuccessful.
+   */
+  PP_Resource (*Create)(PP_Instance instance,
+                        const struct PP_Size* size,
+                        PP_Bool is_always_opaque,
+                        float scale);
+};
+
+typedef struct PPB_Graphics2D_Private_0_1 PPB_Graphics2D_Private;
+/**
+ * @}
+ */
+
+#endif  /* PPAPI_C_PRIVATE_PPB_GRAPHICS_2D_PRIVATE_H_ */
+