Allow various font weights in gfx.

ui/gfx/platform_font_ios.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_IOS_H_
 #define UI_GFX_PLATFORM_FONT_IOS_H_
 
 #include "base/macros.h"
 #include "ui/gfx/platform_font.h"
 
 namespace gfx {
 
 class PlatformFontIOS : public PlatformFont {
  public:
   PlatformFontIOS();
   explicit PlatformFontIOS(NativeFont native_font);
   PlatformFontIOS(const std::string& font_name,
                   int font_size);
 
   // Overridden from PlatformFont:
-  Font DeriveFont(int size_delta, int style) const override;
+  Font DeriveFont(int size_delta,
+                  int style,
+                  gfx::Font::Weight weight) const override;
   int GetHeight() override;
+  gfx::Font::Weight GetWeight() const override;
   int GetBaseline() override;
   int GetCapHeight() override;
   int GetExpectedTextWidth(int length) override;
   int GetStyle() const override;
   const std::string& GetFontName() const override;
   std::string GetActualFontNameForTesting() const override;
   int GetFontSize() const override;
   const FontRenderParams& GetFontRenderParams() override;
   NativeFont GetNativeFont() const override;
 
  private:
-  PlatformFontIOS(const std::string& font_name, int font_size, int style);
+  PlatformFontIOS(const std::string& font_name,
+                  int font_size,
+                  int style,
+                  gfx::Font::Weight weight);

[Alexei Svitkine (slow), 2016/04/04 16:34:51]

Remove gfx::

[Mikus, 2016/04/05 16:18:34]

Done.

   ~PlatformFontIOS() override {}
 
   // Initialize the object with the specified parameters.
   void InitWithNameSizeAndStyle(const std::string& font_name,
                                 int font_size,
-                                int style);
+                                int style,
+                                gfx::Font::Weight weight);
 
   // Calculate and cache the font metrics.
   void CalculateMetrics();
 
   std::string font_name_;
   int font_size_;
   int style_;
+  gfx::Font::Weight weight_;
 
   // Cached metrics, generated at construction.
   int height_;
   int ascent_;
   int cap_height_;
   int average_width_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformFontIOS);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_PLATFORM_FONT_IOS_H_