build iOS with 'make all'

This builds all skia tests by treating iOS tools
as executable applications. A few warnings were
fixed as well.

Removed old trace draw code and remnants.
Review URL: https://codereview.appspot.com/6597063

git-svn-id: http://skia.googlecode.com/svn/trunk@5776 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/skimage_main.cpp b/tools/skimage_main.cpp
index 504bc30..83f115c 100644
--- a/tools/skimage_main.cpp
+++ b/tools/skimage_main.cpp
@@ -54,7 +54,8 @@
     dst->append(".png");
 }
 
-int main (int argc, char * const argv[]) {
+int tool_main(int argc, char** argv);
+int tool_main(int argc, char** argv) {
     SkAutoGraphics ag;
     int i, outDirIndex = 0;
     SkString outDir;
@@ -102,3 +103,9 @@
     return 0;
 }
 
+#if !defined SK_BUILD_FOR_IOS
+int main(int argc, char * const argv[]) {
+    return tool_main(argc, (char**) argv);
+}
+#endif
+