Implement HiDPI support in Pepper dev interface

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 86de406bdf5ed91882a4a3cb2df16944cb52e5ae..cccb7ada1a118aebc8fbd0a3eecc5f0f5a806a3c 100644
--- a/ppapi/tests/test_graphics_2d.cc
+++ b/ppapi/tests/test_graphics_2d.cc
@@ -15,6 +15,7 @@
 #include "ppapi/cpp/image_data.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/module.h"
+#include "ppapi/cpp/private/graphics_2d_private.h"
 #include "ppapi/cpp/rect.h"
 #include "ppapi/tests/testing_instance.h"
 
@@ -51,6 +52,7 @@ void TestGraphics2D::RunTests(const std::string& filter) {
   RUN_TEST_FORCEASYNC_AND_NOT(Scroll, filter);
   RUN_TEST_FORCEASYNC_AND_NOT(Replace, filter);
   RUN_TEST_FORCEASYNC_AND_NOT(Flush, filter);
+  RUN_TEST(Private, filter);
 }
 
 void TestGraphics2D::QuitMessageLoop() {
@@ -628,3 +630,30 @@ std::string TestGraphics2D::TestFlush() {
 
   PASS();
 }
+
+std::string TestGraphics2D::TestPrivate() {
+  // Tests resource creation via the Graphics2DPrivate C++ wrapper
+  const int w=20, h=16;
+  const float scale=2.0f;
+  pp::Graphics2DPrivate dc(instance_, pp::Size(w, h), false, scale);
+  if (dc.is_null())
+    return "Failure creating a boring device";
+
+  // Verify that the context has the specified number of pixels, desipte the
+  // non-identity scale
+  PP_Size size;
+  size.width = -1;
+  size.height = -1;
+  PP_Bool is_always_opaque = PP_FALSE;
+  if (!graphics_2d_interface_->Describe(dc.pp_resource(), &size,
+                                        &is_always_opaque))
+    return "Describe failed";
+  if (size.width != w || size.height != h ||
+      is_always_opaque != PP_FromBool(false))
+    return "Mismatch of data.";
+
+  if (dc.get_scale() != scale)
+    return "Mismatch of get_scale";
+
+  PASS();
+}