Add alpha argument to glResizeCHROMIUM

ppapi/shared_impl/ppb_graphics_3d_shared.cc

Index: ppapi/shared_impl/ppb_graphics_3d_shared.cc
diff --git a/ppapi/shared_impl/ppb_graphics_3d_shared.cc b/ppapi/shared_impl/ppb_graphics_3d_shared.cc
index 854bf51da04e3615bb50f3e460f163d702fdd3f6..3dadacb86c56abffb9cbaa2af6045efdbff45a18 100644
--- a/ppapi/shared_impl/ppb_graphics_3d_shared.cc
+++ b/ppapi/shared_impl/ppb_graphics_3d_shared.cc
@@ -48,7 +48,7 @@ int32_t PPB_Graphics3D_Shared::ResizeBuffers(int32_t width, int32_t height) {
   if ((width < 0) || (height < 0))
     return PP_ERROR_BADARGUMENT;
 
-  gles2_impl()->ResizeCHROMIUM(width, height, 1.f);
+  gles2_impl()->ResizeCHROMIUM(width, height, 1.f, true);
   // TODO(alokp): Check if resize succeeded and return appropriate error code.
   return PP_OK;
 }