Wrap all preprocessor code in the angle namespace.

BUG=836820
BUG=801364

Change-Id: I08b6a2f9f12b689e09df6efd916c313e71e8a051
Reviewed-on: https://chromium-review.googlesource.com/1028581
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
diff --git a/src/compiler/preprocessor/Token.h b/src/compiler/preprocessor/Token.h
index 26732ab..88b9433 100644
--- a/src/compiler/preprocessor/Token.h
+++ b/src/compiler/preprocessor/Token.h
@@ -12,6 +12,9 @@
 
 #include "compiler/preprocessor/SourceLocation.h"
 
+namespace angle
+{
+
 namespace pp
 {
 
@@ -104,6 +107,8 @@
 
 std::ostream &operator<<(std::ostream &out, const Token &token);
 
-}  // namepsace pp
+}  // namespace pp
+
+}  // namespace angle
 
 #endif  // COMPILER_PREPROCESSOR_TOKEN_H_