Added SetLayerTransform to PPAPI

ppapi/api/ppb_graphics_2d.idl

Index: ppapi/api/ppb_graphics_2d.idl
diff --git a/ppapi/api/ppb_graphics_2d.idl b/ppapi/api/ppb_graphics_2d.idl
index 56450f0c29d51ece6b0fb920c95aa067bb2febd5..34c438dfb58e7e33511b5179789d485346f57356 100644
--- a/ppapi/api/ppb_graphics_2d.idl
+++ b/ppapi/api/ppb_graphics_2d.idl
@@ -282,5 +282,24 @@ interface PPB_Graphics2D {
   float_t GetScale(
       [in] PP_Resource resource);
 
+  /**
+   * SetLayerTransform() sets a transformation factor that will be applied for
+   * the current graphics context displayed on the output device.  If both
+   * SetScale and SetLayerTransform will be used, they are going to get combined
+   * for the final result.
+   * This function has no effect until you call Flush().
+   * @param[in] scale The scale to be applied.
+   * @param[in] origin The origin of the scale.
+   * @param[in] translate The translation to be applied.
+   *
+   * @return Returns <code>true</code> on success or <code>false</code>

[piman, 2016/04/15 19:24:39]

nit: PP_TRUE, PP_FALSE instead of true, false.

[alessandroa, 2016/04/21 15:39:22]

Done.

+   * if the resource is invalid or the scale factor is 0 or less.
+   */
+  [version=1.2]
+  PP_Bool SetLayerTransform(
+      [in] PP_Resource resource,
+      [in] float_t scale,
+      [in] PP_Point origin,
+      [in] PP_Point translate);
 };