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/translator/ParseContext.cpp b/src/compiler/translator/ParseContext.cpp
index 5f3c928..6d3a428 100644
--- a/src/compiler/translator/ParseContext.cpp
+++ b/src/compiler/translator/ParseContext.cpp
@@ -194,7 +194,7 @@
                         mShaderVersion,
                         mShaderType,
                         resources.WEBGL_debug_shader_precision == 1),
-      mPreprocessor(mDiagnostics, &mDirectiveHandler, pp::PreprocessorSettings()),
+      mPreprocessor(mDiagnostics, &mDirectiveHandler, angle::pp::PreprocessorSettings()),
       mScanner(nullptr),
       mMinProgramTexelOffset(resources.MinProgramTexelOffset),
       mMaxProgramTexelOffset(resources.MaxProgramTexelOffset),
@@ -1755,7 +1755,7 @@
                                              const char *extName,
                                              const char *behavior)
 {
-    pp::SourceLocation srcLoc;
+    angle::pp::SourceLocation srcLoc;
     srcLoc.file = loc.first_file;
     srcLoc.line = loc.first_line;
     mDirectiveHandler.handleExtension(srcLoc, extName, behavior);
@@ -1766,7 +1766,7 @@
                                           const char *value,
                                           bool stdgl)
 {
-    pp::SourceLocation srcLoc;
+    angle::pp::SourceLocation srcLoc;
     srcLoc.file = loc.first_file;
     srcLoc.line = loc.first_line;
     mDirectiveHandler.handlePragma(srcLoc, name, value, stdgl);