Make Jpeg decoding more fault resistant.

tools/test_image_decoder.cpp

+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkBitmap.h"
+#include "SkForceLinking.h"
+#include "SkGraphics.h"
+#include "SkImageDecoder.h"
+
+__SK_FORCE_IMAGE_DECODER_LINKING;
+
+/**
+   Simple program to test Skia's ability to decode images without
+   errors or debug messages. */
+int main(int argc, char ** argv) {
+    if (argc < 2) {
+        SkDebugf("Usage:\n %s imagefile\n\n", argv[0]);
+        return 3;
+    }
+    SkBitmap bitmap;
+    if (!(SkImageDecoder::DecodeFile(argv[1], &bitmap))) {
+        return 2;
+    }
+    if (bitmap.empty()) {
+        return 1;
+    }
+    return 0;
+}
+