Move HiDPI-related Pepper interfaces to stable

ppapi/api/ppb_view.idl

 /* 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.
  */
 
 /**
  * This file defines the <code>PPB_View</code> struct representing the state
  * of the view of an instance.
  */
 
 [generate_thunk]
 
 label Chrome {
-  M18 = 1.0
+  M18 = 1.0,
+  M27 = 1.1
 };
 
 /**
  * <code>PPB_View</code> represents the state of the view of an instance.
  * You will receive new view information using
  * <code>PPP_Instance.DidChangeView</code>.
  */
 [macro="PPB_VIEW_INTERFACE"]
 interface PPB_View {
   /**
@@ skipping 127 matching lines @@
    * @param resource A <code>PP_Resource</code> corresponding to a
    * <code>PPB_View</code> resource. 
    *
    * @param clip Output argument receiving the clip rect on success.
    *
    * @return Returns <code>PP_TRUE</code> if the resource was valid and the
    * clip rect was filled in, <code>PP_FALSE</code> if not.
    */
   PP_Bool GetClipRect([in] PP_Resource resource,
                       [out] PP_Rect clip);
+
+  /**
+   * GetDeviceScale returns the scale factor between device pixels and DIPs

[dmichael (off chromium), 2013/03/28 21:38:29]

Would be nice to spell out "Device Independent Pixels" at least once.

[Josh Horwich, 2013/03/29 20:54:23]

Done.

+   * (also known as logical pixels or UI pixels on some platforms). This allows
+   * the developer to render their contents at device resolution, even as
+   * coordinates / sizes are given in DIPs through the API.
+   *
+   * Note that the coordinate system for Pepper APIs is DIPs. Also note that
+   * one DIP might not equal one CSS pixel - when page scale/zoom is in effect.
+   *
+   * @param[in] resource A <code>PP_Resource</code> corresponding to a
+   * <code>PPB_View</code> resource.
+   *
+   * @return A <code>float</code> value representing the number of device pixels
+   * per DIP. If the resource is invalid, the value will be 0.0.
+   */
+  [version=1.1]
+  float_t GetDeviceScale([in] PP_Resource resource);
+
+  /**
+   * GetCSSScale returns the scale factor between DIPs and CSS pixels. This
+   * allows proper scaling between DIPs - as sent via the Pepper API - and CSS
+   * pixel coordinates used for Web content.
+   *
+   * @param[in] resource A <code>PP_Resource</code> corresponding to a
+   * <code>PPB_View</code> resource.
+   *
+   * @return css_scale A <code>float</code> value representing the number of
+   * DIPs per CSS pixel. If the resource is invalid, the value will be 0.0.
+   */
+  [version=1.1]
+  float_t GetCSSScale([in] PP_Resource resource);
 };