translator: Scope all classes with "sh".

I was seeing an odd problem with our PoolAlloc conflicting with the
glslang/Vulkan TIntermNode, so the fix was to move everything to a
separate namespace.

The bison grammars are also regenerated. No functional changes.

BUG=angleproject:1576

Change-Id: I959c7afe4c092f0d458432c07b4dcee4d39513f3
Reviewed-on: https://chromium-review.googlesource.com/408267
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
diff --git a/src/compiler/translator/OutputESSL.h b/src/compiler/translator/OutputESSL.h
index 796b1ec..0ef37ae 100644
--- a/src/compiler/translator/OutputESSL.h
+++ b/src/compiler/translator/OutputESSL.h
@@ -9,6 +9,9 @@
 
 #include "compiler/translator/OutputGLSLBase.h"
 
+namespace sh
+{
+
 class TOutputESSL : public TOutputGLSLBase
 {
 public:
@@ -28,4 +31,6 @@
     bool mForceHighp;
 };
 
+}  // namespace sh
+
 #endif  // COMPILER_TRANSLATOR_OUTPUTESSL_H_