Name the namespaces logically.

BUG=18110152

Change-Id: Ib9959d5a3d993048e61887254f42e7de342ec4fd
Reviewed-on: https://swiftshader-review.googlesource.com/1255
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
diff --git a/src/GLES2/libGLESv2/Buffer.cpp b/src/GLES2/libGLESv2/Buffer.cpp
index b198c85..78411ac 100644
--- a/src/GLES2/libGLESv2/Buffer.cpp
+++ b/src/GLES2/libGLESv2/Buffer.cpp
@@ -19,7 +19,7 @@
 #include "VertexDataManager.h"
 #include "IndexDataManager.h"
 
-namespace gl2
+namespace es2
 {
 
 Buffer::Buffer(GLuint id) : RefCountObject(id)