Fix unpacking overlapping unpack buffer rows on NVIDIA GL

gpu/command_buffer/service/texture_manager.h

Index: gpu/command_buffer/service/texture_manager.h
diff --git a/gpu/command_buffer/service/texture_manager.h b/gpu/command_buffer/service/texture_manager.h
index c5a5c052514fdb53f115b4b87fdfec29a217647e..567b4f033a60251b54c1ea3b76439285f392a277 100644
--- a/gpu/command_buffer/service/texture_manager.h
+++ b/gpu/command_buffer/service/texture_manager.h
@@ -660,7 +660,9 @@ struct DecoderTextureState {
             workarounds.force_cube_map_positive_x_allocation),
         force_cube_complete(workarounds.force_cube_complete),
         unpack_alignment_workaround_with_unpack_buffer(
-            workarounds.unpack_alignment_workaround_with_unpack_buffer) {}
+            workarounds.unpack_alignment_workaround_with_unpack_buffer),
+        unpack_overlapping_rows_separately_unpack_buffer(
+            workarounds.unpack_overlapping_rows_separately_unpack_buffer) {}
 
   // This indicates all the following texSubImage*D calls that are part of the
   // failed texImage*D call should be ignored. The client calls have a lock
@@ -676,6 +678,7 @@ struct DecoderTextureState {
   bool force_cube_map_positive_x_allocation;
   bool force_cube_complete;
   bool unpack_alignment_workaround_with_unpack_buffer;
+  bool unpack_overlapping_rows_separately_unpack_buffer;
 };
 
 // This class keeps track of the textures and their sizes so we can do NPOT and
@@ -1086,6 +1089,11 @@ class GPU_EXPORT TextureManager : public base::trace_event::MemoryDumpProvider {
       ContextState* state,
       const DoTexSubImageArguments& args);
 
+  void DoTexSubImageRowByRowWorkaround(DecoderTextureState* texture_state,
+                                       ContextState* state,
+                                       const DoTexSubImageArguments& args,
+                                       const PixelStoreParams& unpack_params);
+
   void StartTracking(TextureRef* texture);
   void StopTracking(TextureRef* texture);