GPU: Build most of the gpu as a single DLL.

gpu/command_buffer/client/gles2_implementation.h

Index: gpu/command_buffer/client/gles2_implementation.h
===================================================================
--- gpu/command_buffer/client/gles2_implementation.h	(revision 124716)
+++ gpu/command_buffer/client/gles2_implementation.h	(working copy)
@@ -17,6 +17,7 @@
 #include "../common/scoped_ptr.h"
 #include "../client/gles2_cmd_helper.h"
 #include "../client/ring_buffer.h"
+#include "gles2_impl_export.h"
 
 #if !defined(NDEBUG) && !defined(__native_client__) && !defined(GLES2_CONFORMANCE_TESTS)  // NOLINT
   #if defined(GLES2_INLINE_OPTIMIZATION)
@@ -104,7 +105,7 @@
 // be had by changing your code to use command buffers directly by using the
 // GLES2CmdHelper but that entails changing your code to use and deal with
 // shared memory and synchronization issues.
-class GLES2Implementation {
+class GLES2_IMPL_EXPORT GLES2Implementation {
  public:
   // Stores client side cached GL state.
   struct GLState {