Enable 64-bit builds on Windows

Encountered compile errors passing 64-bit size_t to
SkIntToScalar and needed to make adjustments to
gm/gradients.cpp and bench/PicturePlaybackBench.cpp.

Verified on my local Linux, Mac, and Windows machines.

As of this change, the skia_arch_width gyp define
actually forces a 32/64-bit build on Linux, Mac, and
Windows.
Review URL: https://codereview.appspot.com/6460112

git-svn-id: http://skia.googlecode.com/svn/trunk@5195 2bbb7eff-a529-9590-31e7-b0007b416f81

bench/PicturePlaybackBench.cpp

@@ -119,7 +119,7 @@ protected:
                     if (fDrawPosH)
                         pos[i].set(x + advX, y);
                     else
-                        pos[i].set(x + advX, y + SkIntToScalar(i));
+                        pos[i].set(x + advX, y + i);
                     advX += adv[i];
                 }
 

gm/gradients.cpp

@@ -169,9 +169,9 @@ protected:
                 // apply an increasing y perspective as we move to the right
                 SkMatrix perspective;
                 perspective.setIdentity();
-                perspective.setPerspY(SkScalarDiv(SkIntToScalar(i+1),
+                perspective.setPerspY(SkScalarDiv(SkIntToScalar((unsigned) i+1),
                                       SkIntToScalar(500)));
-                perspective.setSkewX(SkScalarDiv(SkIntToScalar(i+1),
+                perspective.setSkewX(SkScalarDiv(SkIntToScalar((unsigned) i+1),
                                      SkIntToScalar(10)));
                 shader->setLocalMatrix(perspective);
 

gyp/common_conditions.gypi

@@ -85,6 +85,14 @@
             },
           },
         },
+        'conditions' : [
+          ['skia_arch_width == 64', {
+            'msvs_configuration_platform': 'x64'
+          }],
+          ['skia_arch_width == 32', {
+            'msvs_configuration_platform': 'Win32',
+          }],
+        ],
       },
     ],