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/ExtensionGLSL.h b/src/compiler/translator/ExtensionGLSL.h
index 6bb84d6..3c2dbe0 100644
--- a/src/compiler/translator/ExtensionGLSL.h
+++ b/src/compiler/translator/ExtensionGLSL.h
@@ -14,6 +14,9 @@
 
 #include "compiler/translator/IntermNode.h"
 
+namespace sh
+{
+
 // Traverses the intermediate tree to determine which GLSL extensions are required
 // to support the shader.
 class TExtensionGLSL : public TIntermTraverser
@@ -36,4 +39,6 @@
     std::set<std::string> mRequiredExtensions;
 };
 
+}  // namespace sh
+
 #endif  // COMPILER_TRANSLATOR_EXTENSIONGLSL_H_