Enable GL_CHROMIUM_post_sub_buffer for osmesa

webkit/gpu/webgraphicscontext3d_in_process_impl.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "webkit/gpu/webgraphicscontext3d_in_process_impl.h"
 
 #include <string.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 1236 matching lines @@
   scoped_array<GLchar> log(new GLchar[log_length]);
   GLsizei returned_log_length;
   glGetShaderSource(shader, log_length, &returned_log_length, log.get());
   DCHECK(log_length == returned_log_length + 1);
   WebString res = WebString::fromUTF8(log.get(), returned_log_length);
   return res;
 }
 
 WebString WebGraphicsContext3DInProcessImpl::getString(WGC3Denum name) {
   makeContextCurrent();
-  std::string result(reinterpret_cast<const char*>(glGetString(name)));
+  std::string result;
   if (name == GL_EXTENSIONS) {
+    result = gl_context_->GetExtensions();
     if (!is_gles2_) {
       std::vector<std::string> split;
       base::SplitString(result, ' ', &split);
       if (std::find(split.begin(), split.end(), "GL_EXT_bgra") != split.end()) {
         // If we support GL_EXT_bgra, pretend we support a couple of GLES2
         // extension that are a subset of it.
         result += " GL_EXT_texture_format_BGRA8888 GL_EXT_read_format_bgra";
       }
     }
+  } else {
+    result = reinterpret_cast<const char*>(glGetString(name));
   }
   return WebString::fromUTF8(result.c_str());
 }
 
 DELEGATE_TO_GL_3(getTexParameterfv, GetTexParameterfv,
                  WGC3Denum, WGC3Denum, WGC3Dfloat*)
 
 DELEGATE_TO_GL_3(getTexParameteriv, GetTexParameteriv,
                  WGC3Denum, WGC3Denum, WGC3Dint*)
 
@@ skipping 417 matching lines @@
   if (length > 1) {
     entry->translated_source.reset(new char[length]);
     ShGetObjectCode(compiler, entry->translated_source.get());
   }
   entry->is_valid = true;
   return true;
 }
 
 }  // namespace gpu
 }  // namespace webkit