Add a query function for the scaling feature.

ppapi/tests/test_graphics_2d.cc

Index: ppapi/tests/test_graphics_2d.cc
diff --git a/ppapi/tests/test_graphics_2d.cc b/ppapi/tests/test_graphics_2d.cc
index f8f23f5900f80f7215a83df8e303c7ce21f829f2..1c6d69f99bcfa8674a8bd549546d035b1d6316c4 100644
--- a/ppapi/tests/test_graphics_2d.cc
+++ b/ppapi/tests/test_graphics_2d.cc
@@ -632,13 +632,13 @@ std::string TestGraphics2D::TestFlush() {
 }
 
 std::string TestGraphics2D::TestDev() {
-  // Tests GetScale/SetScale via the Graphics2DDev C++ wrapper
+  // Tests GetScale/SetScale via the Graphics2D_Dev C++ wrapper
   const int w=20, h=16;
   const float scale=1.0f/2.0f;
   pp::Graphics2D dc(instance_, pp::Size(w, h), false);
   if (dc.is_null())
     return "Failure creating a boring device";
-  pp::Graphics2DDev dc_dev(dc);
+  pp::Graphics2D_Dev dc_dev(dc);
   if (dc_dev.GetScale() != 1.0f)
     return "GetScale returned unexpected value before SetScale";
   if (!dc_dev.SetScale(scale))