Merge to XFA: Make clang_warning_flags work for standalone builds.

Also fix a newly introduced override warning.
Also define a host_clang GYP variable.

TBR=thakis@chromium.org

Review URL: https://codereview.chromium.org/1532723003 .
Review URL: https://codereview.chromium.org/1533763002 .

(cherry picked from commit e096ca507db9944aebc47d6c2cc1c6fab39498c5)
(cherry picked from commit 0a9158b99a2002fb82301ebec20dbc23b3fc084c)

Review URL: https://codereview.chromium.org/1535603003 .

1 files changed, 2 insertions, 2 deletions

diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_unittest.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_unittest.cpp
index aba639c850..d3187c1ff4 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_unittest.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_unittest.cpp
@@ -43,7 +43,7 @@ class CFX_TestBufferRead : public IFX_FileRead {
   void Release() override { delete this; }
 
   // IFX_FileRead
-  virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) {
+  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
     if (offset < 0 || offset + size > total_size_) {
       return FALSE;
     }
@@ -51,7 +51,7 @@ class CFX_TestBufferRead : public IFX_FileRead {
     memcpy(buffer, buffer_ + offset, size);
     return TRUE;
   }
-  virtual FX_FILESIZE GetSize() { return (FX_FILESIZE)total_size_; };
+  FX_FILESIZE GetSize() override { return (FX_FILESIZE)total_size_; };
 
  protected:
   const unsigned char* buffer_;