Implemented support for GL constext share groups in the renderer process.

gpu/command_buffer/service/context_group.h

Index: gpu/command_buffer/service/context_group.h
===================================================================
--- gpu/command_buffer/service/context_group.h	(revision 95161)
+++ gpu/command_buffer/service/context_group.h	(working copy)
@@ -11,12 +11,13 @@
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "gpu/command_buffer/common/gles2_cmd_format.h"
 #include "gpu/command_buffer/service/gles2_cmd_validation.h"
 #include "gpu/command_buffer/service/feature_info.h"
 
 namespace gpu {
 
-class IdAllocator;
+class IdAllocatorInterface;
 
 namespace gles2 {
 
@@ -103,7 +104,7 @@
     return shader_manager_.get();
   }
 
-  IdAllocator* GetIdAllocator(unsigned namepsace_id);
+  IdAllocatorInterface* GetIdAllocator(unsigned namespace_id);
 
  private:
   // Destroys all the resources.
@@ -133,8 +134,8 @@
 
   scoped_ptr<ShaderManager> shader_manager_;
 
-  typedef base::hash_map<uint32, linked_ptr<IdAllocator> > IdAllocatorMap;
-  IdAllocatorMap id_namespaces_;
+  linked_ptr<IdAllocatorInterface>
+      id_namespaces_[id_namespaces::kNumIdNamespaces];
 
   FeatureInfo feature_info_;