Make GMs aware of what tool they're being run in.

gm/gm.h

Index: gm/gm.h
diff --git a/gm/gm.h b/gm/gm.h
index bb20c9cf59e4cb5f54bd4955e9ac37afb04fc7e3..4da688c7ffe86343aabe67f97a24c97c7729ee52 100644
--- a/gm/gm.h
+++ b/gm/gm.h
@@ -53,6 +53,15 @@ namespace skiagm {
             kAsBench_Flag               = 1 << 10, // Run the GM as a benchmark in the bench tool
         };
 
+        enum Mode {
+            kGM_Mode,
+            kSample_Mode,
+            kBench_Mode,
+        };
+
+        void setMode(Mode mode) { fMode = mode; }
+        Mode getMode() const { return fMode; }
+
         void draw(SkCanvas*);
         void drawBackground(SkCanvas*);
         void drawContent(SkCanvas*);
@@ -101,10 +110,10 @@ namespace skiagm {
             fCanvasIsDeferred = isDeferred;
         }
 
-    const SkMatrix& getStarterMatrix() { return fStarterMatrix; }
-    void setStarterMatrix(const SkMatrix& matrix) {
-        fStarterMatrix = matrix;
-    }
+        const SkMatrix& getStarterMatrix() { return fStarterMatrix; }
+        void setStarterMatrix(const SkMatrix& matrix) {
+            fStarterMatrix = matrix;
+        }
 
     protected:
         static SkString gResourcePath;
@@ -118,6 +127,7 @@ namespace skiagm {
         virtual SkMatrix onGetInitialTransform() const { return SkMatrix::I(); }
 
     private:
+        Mode     fMode;
         SkString fShortName;
         SkColor  fBGColor;
         bool     fCanvasIsDeferred; // work-around problem in srcmode.cpp