Reset TexImage2D base level to workaround Intel mac driver bug

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 02c5c1119c781cf6a62d236fcfe521d00ac3ceef..73be925b3229e411743ccd047e50365b0e1f9823 100644
--- a/gpu/command_buffer/service/texture_manager.h
+++ b/gpu/command_buffer/service/texture_manager.h
@@ -697,7 +697,7 @@ class GPU_EXPORT TextureRef : public base::RefCounted<TextureRef> {
 
 // Holds data that is per gles2_cmd_decoder, but is related to to the
 // TextureManager.
-struct DecoderTextureState {
+struct GPU_EXPORT DecoderTextureState {
   // total_texture_upload_time automatically initialized to 0 in default
   // constructor.
   explicit DecoderTextureState(const GpuDriverBugWorkarounds& workarounds);
@@ -1129,6 +1129,13 @@ class GPU_EXPORT TextureManager : public base::trace_event::MemoryDumpProvider {
                         texture_ref, function_name, args);
   }
 
+  void DoTexImage(DecoderTextureState* texture_state,
+                  ContextState* state,
+                  DecoderFramebufferState* framebuffer_state,
+                  const char* function_name,
+                  TextureRef* texture_ref,
+                  const DoTexImageArguments& args);
+

[yizhou.jiang, 2017/06/09 07:58:16]

I move DoTexImage to public in order to test it in Texture_manager_unittests.cc.

  private:
   friend class Texture;
   friend class TextureRef;
@@ -1138,14 +1145,6 @@ class GPU_EXPORT TextureManager : public base::trace_event::MemoryDumpProvider {
       GLenum target,
       GLuint* black_texture);
 
-  void DoTexImage(
-      DecoderTextureState* texture_state,
-      ContextState* state,
-      DecoderFramebufferState* framebuffer_state,
-      const char* function_name,
-      TextureRef* texture_ref,
-      const DoTexImageArguments& args);
-
   // Reserve memory for the texture and set its attributes so it can be filled
   // with TexSubImage. The image contents are undefined after this function,
   // so make sure it's subsequently filled in its entirety.