Add texture filtering override to debugger

src/utils/debugger/SkDebugCanvas.h

Index: src/utils/debugger/SkDebugCanvas.h
===================================================================
--- src/utils/debugger/SkDebugCanvas.h	(revision 11819)
+++ src/utils/debugger/SkDebugCanvas.h	(working copy)
@@ -16,6 +16,8 @@
 #include "SkTArray.h"
 #include "SkString.h"
 
+class SkTexOverrideFilter;
+
 class SK_API SkDebugCanvas : public SkCanvas {
 public:
     SkDebugCanvas(int width, int height);
@@ -29,6 +31,11 @@
     void setOverdrawViz(bool overdrawViz) { fOverdrawViz = overdrawViz; }
 
     /**
+     * Enable or disable texure filtering override
+     */
+    void overrideTexFiltering(bool overrideTexFiltering, SkPaint::FilterLevel level); 
+
+    /**
         Executes all draw calls to the canvas.
         @param canvas  The canvas being drawn to
      */
@@ -245,9 +252,13 @@
     SkMatrix fUserMatrix;
     SkMatrix fMatrix;
     SkIRect fClip;
+
     bool fOverdrawViz;
     SkDrawFilter* fOverdrawFilter;
 
+    bool fOverrideTexFiltering;
+    SkTexOverrideFilter* fTexOverrideFilter;
+
     /**
         Number of unmatched save() calls at any point during a draw.
         If there are any saveLayer() calls outstanding, we need to resolve