Add looping over optimizations to filter tool

tools/filtermain.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDebugCanvas.h"
 #include "SkDevice.h"
 #include "SkGraphics.h"
@@ skipping 518 matching lines @@
     debugCanvas.setBounds(inPicture->width(), inPicture->height());
     inPicture->draw(&debugCanvas);
 
     // delete the initial save and restore since replaying the commands will
     // re-add them
     if (debugCanvas.getSize() > 1) {
         debugCanvas.deleteDrawCommandAt(0);
         debugCanvas.deleteDrawCommandAt(debugCanvas.getSize()-1);
     }
 
-    for (int i = 0; i < debugCanvas.getSize(); ++i) {
-        for (size_t opt = 0; opt < SK_ARRAY_COUNT(gOptTable); ++opt) {
-            if ((*gOptTable[opt].fCheck)(&debugCanvas, i)) {
-                (*gOptTable[opt].fApply)(&debugCanvas, i);
-                ++gOptTable[opt].fNumTimesApplied;
-                ++localCount[opt];
+    bool changed = true;
+
+    while (changed) {
+        changed = false;
+        for (int i = 0; i < debugCanvas.getSize(); ++i) {
+            for (size_t opt = 0; opt < SK_ARRAY_COUNT(gOptTable); ++opt) {
+                if ((*gOptTable[opt].fCheck)(&debugCanvas, i)) {
+                    (*gOptTable[opt].fApply)(&debugCanvas, i);
+
+                    ++gOptTable[opt].fNumTimesApplied;
+                    ++localCount[opt];
+
+                    if (debugCanvas.getSize() == i) {
+                        // the optimization removed all the remaining operations
+                        break;
+                    }
+
+                    opt = 0;          // try all the opts all over again
+                    changed = true;
+                }
             }
         }
     }
 
     if (!outFile.isEmpty()) {
         SkPicture outPicture;
 
         SkCanvas* canvas = outPicture.beginRecording(inPicture->width(), inPicture->height());
         debugCanvas.draw(canvas);
         outPicture.endRecording();
@@ skipping 109 matching lines @@
 
     SkGraphics::Term();
     return 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif