Workground for glGenerateMipmap bug in some drivers.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 5444b153aa0a6c1497fd7d36f81854f63f72f591..639de6ae63d06730a8f4d3b443952628be45bb20 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -2856,7 +2856,11 @@ void GLES2DecoderImpl::DoGenerateMipmap(GLenum target) {
                "glGenerateMipmaps: Can not generate mips for npot textures");
     return;
   }
+  // Workaround for Mac driver bug. Since glGenerateMipmap is not a high

[apatrick_chromium, 2011/03/25 21:53:26]

I might expect it to be high performance if I was implementing a bloom filter or
tone mapping. I understand the rationale. Maybe just change the comment?

+  // performance function there's no need to make this conditional.
+  glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);
   glGenerateMipmapEXT(target);
+  glTexParameteri(target, GL_TEXTURE_MIN_FILTER, info->min_filter());
 }
 
 bool GLES2DecoderImpl::GetHelper(