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/gm/gmmain.cpp b/gm/gmmain.cpp
index 1b56bf1..f0de5bd 100644
--- a/gm/gmmain.cpp
+++ b/gm/gmmain.cpp
@@ -862,7 +862,8 @@
 #endif
 }
 
-int main(int argc, char * const argv[]) {
+int tool_main(int argc, char** argv);
+int tool_main(int argc, char** argv) {
 
 #ifdef SK_ENABLE_INST_COUNT
     gPrintInstCount = true;
@@ -1172,3 +1173,10 @@
 
     return (0 == testsFailed) ? 0 : -1;
 }
+
+#if !defined SK_BUILD_FOR_IOS
+int main(int argc, char * const argv[]) {
+    return tool_main(argc, (char**) argv);
+}
+#endif
+