always use 64 bit long for fixed mul

src/gpu/GrDistanceFieldTextContext.cpp

Index: src/gpu/GrDistanceFieldTextContext.cpp
diff --git a/src/gpu/GrDistanceFieldTextContext.cpp b/src/gpu/GrDistanceFieldTextContext.cpp
index fe6e50fbde0b769debd2a194044dae42c278b018..86287008e7e1864e954a9831775dde85a143a132 100755
--- a/src/gpu/GrDistanceFieldTextContext.cpp
+++ b/src/gpu/GrDistanceFieldTextContext.cpp
@@ -501,8 +501,8 @@ void GrDistanceFieldTextContext::drawText(const GrPaint& paint, const SkPaint& s
                                   fontScaler);
         }
 
-        fx += SkFixedMul_portable(glyph.fAdvanceX, fixedScale);
-        fy += SkFixedMul_portable(glyph.fAdvanceY, fixedScale);
+        fx += SkFixedMul_longlong(glyph.fAdvanceX, fixedScale);
+        fy += SkFixedMul_longlong(glyph.fAdvanceY, fixedScale);
     }
 
     this->finish();