Change PDF scaling factor from double to float.

ui/gfx/gdi_util.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/gdi_util.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace gfx {
@@ skipping 78 matching lines @@
     windows_points[i].y = SkScalarRoundToInt(points[i].fY);
   }
 
   return ::CreatePolygonRgn(windows_points.get(), point_count, ALTERNATE);
 #elif defined(OS_WIN)
   return path.CreateNativeRegion();
 #endif
 }
 
 
-double CalculatePageScale(HDC dc, int page_width, int page_height) {
+float CalculatePageScale(HDC dc, int page_width, int page_height) {
   int dc_width = GetDeviceCaps(dc, HORZRES);
   int dc_height = GetDeviceCaps(dc, VERTRES);
 
   // If page fits DC - no scaling needed.
   if (dc_width >= page_width && dc_height >= page_height)
     return 1.0;
 
-  double x_factor =
-      static_cast<double>(dc_width) / static_cast<double>(page_width);
-  double y_factor =
-      static_cast<double>(dc_height) / static_cast<double>(page_height);
+  float x_factor =
+      static_cast<float>(dc_width) / static_cast<float>(page_width);
+  float y_factor =
+      static_cast<float>(dc_height) / static_cast<float>(page_height);
   return std::min(x_factor, y_factor);
 }
 
 // Apply scaling to the DC.
-bool ScaleDC(HDC dc, double scale_factor) {
+bool ScaleDC(HDC dc, float scale_factor) {
   SetGraphicsMode(dc, GM_ADVANCED);
   XFORM xform = {0};
   xform.eM11 = xform.eM22 = scale_factor;
   return !!ModifyWorldTransform(dc, &xform, MWT_LEFTMULTIPLY);
 }
 
 void StretchDIBits(HDC hdc, int dest_x, int dest_y, int dest_w, int dest_h,
                    int src_x, int src_y, int src_w, int src_h, void* pixels,
                    const BITMAPINFO* bitmap_info) {
   // When blitting a rectangle that touches the bottom, left corner of the
@@ skipping 10 matching lines @@
   } else {
     rv = ::StretchDIBits(hdc,
                          dest_x, dest_y, dest_w, dest_h,
                          src_x, bottom_up_src_y, src_w, src_h,
                          pixels, bitmap_info, DIB_RGB_COLORS, SRCCOPY);
   }
   DCHECK(rv != GDI_ERROR);
 }
 
 }  // namespace gfx