Fix ChartBench crash.

git-svn-id: http://skia.googlecode.com/svn/trunk@7826 2bbb7eff-a529-9590-31e7-b0007b416f81

bench/ChartBench.cpp

@@ -94,6 +94,8 @@ public:
     ChartBench(void* param, bool aa) : SkBenchmark(param) {
         fShift = 0;
         fAA = aa;
+        fSize.fWidth = -1;
+        fSize.fHeight = -1;
     }
 
 protected:
@@ -115,8 +117,6 @@ protected:
         SkScalar ySpread = SkIntToScalar(fSize.fHeight / 20);
 
         SkScalar height = SkIntToScalar(fSize.fHeight);
-
-        for (int frame = 0; frame < kFramesPerRun; ++frame) {
         if (sizeChanged) {
             int dataPointCount = SkMax32(fSize.fWidth / kPixelsPerTick + 1, 2);
 
@@ -125,9 +125,10 @@ protected:
                 fData[i].reset();
                 gen_data(y, ySpread, dataPointCount, fData + i);
             }
-                sizeChanged = false;
         }
 
+        for (int frame = 0; frame < kFramesPerRun; ++frame) {
+
             canvas->clear(0xFFE0F0E0);
 
             static SkMWCRandom colorRand;