Bug 1065764, part 1 - Make gfxMatrix::NudgeToIntegers() return a reference. r=Bas

gfx/thebes/gfxMatrix.cpp

@@ -147,7 +147,7 @@ static void NudgeToInteger(double *aVal)
     *aVal = f;
 }
 
-void
+gfxMatrix&
 gfxMatrix::NudgeToIntegers(void)
 {
     NudgeToInteger(&_11);
@@ -156,4 +156,5 @@ gfxMatrix::NudgeToIntegers(void)
     NudgeToInteger(&_22);
     NudgeToInteger(&_31);
     NudgeToInteger(&_32);
+    return *this;
 }

gfx/thebes/gfxMatrix.h

@@ -284,7 +284,7 @@ public:
      * to integers. In particular, components that are integral when
      * converted to single precision are set to those integers.
      */
-    void NudgeToIntegers(void);
+    gfxMatrix& NudgeToIntegers(void);
 
     /**
      * Returns true if matrix is multiple of 90 degrees rotation with flipping,