RenderTextHarfBuzz: Try fallback fonts of the Uniscribe font while shaping

ui/gfx/platform_font_win.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_PLATFORM_FONT_WIN_H_
 #define UI_GFX_PLATFORM_FONT_WIN_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
+#include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "ui/gfx/gfx_export.h"
 #include "ui/gfx/platform_font.h"
 
 namespace gfx {
 
 class GFX_EXPORT PlatformFontWin : public PlatformFont {
  public:
   PlatformFontWin();
   explicit PlatformFontWin(NativeFont native_font);
@@ skipping 39 matching lines @@
   virtual int GetCapHeight() const override;
   virtual int GetExpectedTextWidth(int length) const override;
   virtual int GetStyle() const override;
   virtual std::string GetFontName() const override;
   virtual std::string GetActualFontNameForTesting() const override;
   virtual int GetFontSize() const override;
   virtual const FontRenderParams& GetFontRenderParams() const override;
   virtual NativeFont GetNativeFont() const override;
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(RenderTextTest, HarfBuzz_UniscribeFallback);
+
   virtual ~PlatformFontWin() {}
 
   // Chrome text drawing bottoms out in the Windows GDI functions that take an
   // HFONT (an opaque handle into Windows). To avoid lots of GDI object
   // allocation and destruction, Font indirectly refers to the HFONT by way of
   // an HFontRef. That is, every Font has an HFontRef, which has an HFONT.
   //
   // HFontRef is reference counted. Upon deletion, it deletes the HFONT.
   // By making HFontRef maintain the reference to the HFONT, multiple
   // HFontRefs can share the same HFONT, and Font can provide value semantics.
@@ skipping 18 matching lines @@
     int style() const { return style_; }
     const std::string& font_name() const { return font_name_; }
     int font_size() const { return font_size_; }
     int requested_font_size() const { return requested_font_size_; }
 
     // Returns the average character width in dialog units.
     int GetDluBaseX();
 
    private:
     friend class base::RefCounted<HFontRef>;
+    FRIEND_TEST_ALL_PREFIXES(RenderTextTest, HarfBuzz_UniscribeFallback);
 
     ~HFontRef();
 
     const HFONT hfont_;
     const int font_size_;
     const int height_;
     const int baseline_;
     const int cap_height_;
     const int ave_char_width_;
     const int style_;
@@ skipping 42 matching lines @@
 
   // Indirect reference to the HFontRef, which references the underlying HFONT.
   scoped_refptr<HFontRef> font_ref_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformFontWin);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_PLATFORM_FONT_WIN_H_