ui/gfx: Make gfx::Canvas inherit from gfx::CanvasSkia.

ui/gfx/canvas_skia_linux.cc

 // 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.
 
 #include "ui/gfx/canvas_skia.h"
 
 #include <algorithm>
 
 #include <cairo/cairo.h>
 #include <pango/pango.h>
 #include <pango/pangocairo.h>
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "ui/gfx/font.h"
 #include "ui/gfx/pango_util.h"
 #include "ui/gfx/platform_font_pango.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/skia_util.h"
+#include "ui/gfx/canvas.h"
 
 using std::max;
 
 namespace {
 
 // Multiply by the text height to determine how much text should be faded
 // when elliding.
 const double kFadeWidthFactor = 1.5;
 
 // End state of the elliding fade.
@@ skipping 223 matching lines @@
                                int flags) {
   if (!IntersectsClipRectInt(x, y, w, h))
     return;
 
   gfx::Rect bounds(x, y, w, h);
   DrawStringContext context(this, text, font, bounds, bounds, flags);
   context.Draw(color);
 }
 
 }  // namespace gfx