Fixed some bugs that prevented the GPU plugin from shutting down without cras...

gpu/command_buffer/client/gles2_implementation.cc

Index: gpu/command_buffer/client/gles2_implementation.cc
===================================================================
--- gpu/command_buffer/client/gles2_implementation.cc	(revision 35801)
+++ gpu/command_buffer/client/gles2_implementation.cc	(working copy)
@@ -40,6 +40,10 @@
   result_shm_offset_ = transfer_buffer_.GetOffset(result_buffer_);
 }
 
+GLES2Implementation::~GLES2Implementation() {
+  transfer_buffer_.Free(result_buffer_);
+}
+
 void GLES2Implementation::MakeIds(GLsizei n, GLuint* ids) {
   for (GLsizei ii = 0; ii < n; ++ii) {
     ids[ii] = id_allocator_.AllocateID();