Added idl file for Pepper 3D.

ppapi/cpp/graphics_3d.h

Index: ppapi/cpp/graphics_3d.h
===================================================================
--- ppapi/cpp/graphics_3d.h	(revision 120596)
+++ ppapi/cpp/graphics_3d.h	(working copy)
@@ -62,7 +62,7 @@
   ///
   /// On failure, the object will be is_null().
   Graphics3D(const Instance* instance,
-             const int32_t* attrib_list);
+             const int32_t attrib_list[]);
 
   /// A constructor for creating and initializing a 3D rendering context. The
   /// returned context is created off-screen. It must be attached to a
@@ -86,7 +86,7 @@
   /// On failure, the object will be is_null().
   Graphics3D(const Instance* instance,
              const Graphics3D& share_context,
-             const int32_t* attrib_list);
+             const int32_t attrib_list[]);
 
   /// Destructor.
   ~Graphics3D();
@@ -120,7 +120,7 @@
   /// </code>
   ///
   /// This example retrieves the values for rgb bits in the color buffer.
-  int32_t GetAttribs(int32_t* attrib_list) const;
+  int32_t GetAttribs(int32_t attrib_list[]) const;
 
   /// SetAttribs() sets the values for each attribute in
   /// <code>attrib_list</code>. The list has the same structure as the list
@@ -133,7 +133,7 @@
   /// - PP_ERROR_BADRESOURCE if context is invalid.
   /// - PP_ERROR_BADARGUMENT if attrib_list is NULL or any attribute in the
   ///   attrib_list is not a valid attribute.
-  int32_t SetAttribs(int32_t* attrib_list);
+  int32_t SetAttribs(const int32_t attrib_list[]);
 
   /// ResizeBuffers() resizes the backing surface for the context.
   ///