Allow CanvasSkia to bind to an existing SkCanvas.

ui/gfx/render_text_linux.cc

 // Copyright (c) 2011 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/render_text_linux.h"
 
 #include <pango/pangocairo.h>
 
 #include <algorithm>
 
@@ skipping 76 matching lines @@
   int width;
   pango_layout_get_pixel_size(layout, &width, NULL);
   return width;
 }
 
 void RenderTextLinux::Draw(Canvas* canvas) {
   PangoLayout* layout = EnsureLayout();
   Rect bounds(display_rect());
 
   // Clip the canvas to the text display area.
-  CanvasSkia* canvas_skia = canvas->AsCanvasSkia();
+  SkCanvas* canvas_skia = canvas->GetSkCanvas();
 
   skia::ScopedPlatformPaint scoped_platform_paint(canvas_skia);
   cairo_t* cr = scoped_platform_paint.GetPlatformSurface();
   cairo_save(cr);
   cairo_rectangle(cr, bounds.x(), bounds.y(), bounds.width(), bounds.height());
   cairo_clip(cr);
 
   int text_width, text_height;
   pango_layout_get_pixel_size(layout, &text_width, &text_height);
   Point offset(ToViewPoint(Point()));
@@ skipping 383 matching lines @@
         return right;
     }
   }
 
   return right_end;
 }
 
 PangoLayout* RenderTextLinux::EnsureLayout() {
   if (layout_ == NULL) {
     CanvasSkia canvas(display_rect().width(), display_rect().height(), false);
-    skia::ScopedPlatformPaint scoped_platform_paint(&canvas);
+    skia::ScopedPlatformPaint scoped_platform_paint(canvas.sk_canvas());
     cairo_t* cr = scoped_platform_paint.GetPlatformSurface();
 
     layout_ = pango_cairo_create_layout(cr);
     SetupPangoLayout(
         layout_,
         text(),
         default_style().font,
         display_rect().width(),
         base::i18n::GetFirstStrongCharacterDirection(text()),
         CanvasSkia::DefaultCanvasTextAlignment());
@@ skipping 160 matching lines @@
 size_t RenderTextLinux::Utf8IndexToUtf16Index(size_t index) const {
   int32_t utf16_index = 0;
   UErrorCode ec = U_ZERO_ERROR;
   u_strFromUTF8(NULL, 0, &utf16_index, layout_text_, index, &ec);
   DCHECK(ec == U_BUFFER_OVERFLOW_ERROR ||
          ec == U_STRING_NOT_TERMINATED_WARNING);
   return utf16_index;
 }
 
 }  // namespace gfx