Turn on -Wall -Wextra on Mac, and fix all the warnings that crop up for /usr/bin/g++ and Clang 3.3.

src/core/SkBitmapScaler.cpp

 #include "SkBitmapScaler.h"
 #include "SkBitmapFilter.h"
 #include "SkRect.h"
 #include "SkTArray.h"
 #include "SkErrorInternals.h"
 #include "SkConvolver.h"
 
 // SkResizeFilter ----------------------------------------------------------------
 
 // Encapsulates computation and storage of the filters required for one complete
@@ skipping 27 matching lines @@
     //
     // Likewise, the range of destination values to compute and the scale factor
     // for the transform is also specified.
 
     void computeFilters(int srcSize,
                         int destSubsetLo, int destSubsetSize,
                         float scale,
                         SkConvolutionFilter1D* output,
                         SkConvolutionProcs* convolveProcs);
 
-    // Subset of scaled destination bitmap to compute.
-    SkIRect fOutBounds;
-
     SkConvolutionFilter1D fXFilter;
     SkConvolutionFilter1D fYFilter;
 };
 
 SkResizeFilter::SkResizeFilter(SkBitmapScaler::ResizeMethod method,
                                int srcFullWidth, int srcFullHeight,
                                int destWidth, int destHeight,
                                const SkIRect& destSubset,
-                               SkConvolutionProcs* convolveProcs)
-                       : fOutBounds(destSubset) {
+                               SkConvolutionProcs* convolveProcs) {
 
     // method will only ever refer to an "algorithm method".
     SkASSERT((SkBitmapScaler::RESIZE_FIRST_ALGORITHM_METHOD <= method) &&
              (method <= SkBitmapScaler::RESIZE_LAST_ALGORITHM_METHOD));
 
     switch(method) {
         case SkBitmapScaler::RESIZE_BOX:
             fBitmapFilter = SkNEW(SkBoxFilter);
             break;
         case SkBitmapScaler::RESIZE_TRIANGLE:
@@ skipping 235 matching lines @@
 // static
 SkBitmap SkBitmapScaler::Resize(const SkBitmap& source,
                                 ResizeMethod method,
                                 int destWidth, int destHeight,
                                 SkConvolutionProcs* convolveProcs,
                                 SkBitmap::Allocator* allocator) {
     SkIRect destSubset = { 0, 0, destWidth, destHeight };
     return Resize(source, method, destWidth, destHeight, destSubset,
                   convolveProcs, allocator);
 }