Fix sporadic crash at the end of gles2 ppapi plugin

ppapi/examples/gles2/gles2.cc

Index: ppapi/examples/gles2/gles2.cc
diff --git a/ppapi/examples/gles2/gles2.cc b/ppapi/examples/gles2/gles2.cc
index aa3a4fbc2e59ef0eddc1d40b5c29cd209f2d9bb1..c845e1d1fb234ad5cd9625ed55d779fa28f753d7 100644
--- a/ppapi/examples/gles2/gles2.cc
+++ b/ppapi/examples/gles2/gles2.cc
@@ -85,6 +85,7 @@ class GLES2DemoInstance : public pp::Instance,
   void DecodeNextNALUs();
   void DecodeNextNALU();
   void GetNextNALUBoundary(size_t start_pos, size_t* end_pos);
+  void PaintPicture(const PP_Picture_Dev& picture);
   void Render(const PP_PictureBuffer_Dev& buffer);
   void DeleteOutstandingBitstreamBuffers();
 
@@ -324,6 +325,10 @@ void GLES2DemoInstance::DismissPictureBuffer(PP_Resource decoder,
 void GLES2DemoInstance::PictureReady(PP_Resource decoder,
                                      const PP_Picture_Dev& picture) {
   assert(decoder == video_decoder_->pp_resource());
+  PaintPicture(picture);
+}
+
+void GLES2DemoInstance::PaintPicture(const PP_Picture_Dev& picture) {
   if (first_frame_delivered_ticks_ == -1)
     assert((first_frame_delivered_ticks_ = core_if_->GetTimeTicks()) != -1);
   if (is_painting_) {
@@ -419,7 +424,7 @@ void GLES2DemoInstance::PaintFinished(int32_t result, int picture_buffer_id) {
   while (!pictures_pending_paint_.empty() && !is_painting_) {
     PP_Picture_Dev picture = pictures_pending_paint_.front();
     pictures_pending_paint_.pop_front();
-    PictureReady(video_decoder_->pp_resource(), picture);
+    PaintPicture(picture);
   }
 }