fix warnings on Mac in ssamplecode

Fix these class of warnings:
- unused functions
- unused locals
- sign mismatch
- missing function prototypes
- missing newline at end of file
- 64 to 32 bit truncation

The changes prefer to link in dead code in the debug build
with 'if (false)' than to comment it out, but trivial cases
are commented out or sometimes deleted if it appears to be
a copy/paste error.
Review URL: https://codereview.appspot.com/6301044

git-svn-id: http://skia.googlecode.com/svn/trunk@4183 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleRegion.cpp b/samplecode/SampleRegion.cpp
index b4d540c..5eed81e 100644
--- a/samplecode/SampleRegion.cpp
+++ b/samplecode/SampleRegion.cpp
@@ -323,8 +323,14 @@
     }
     
     virtual void onDrawContent(SkCanvas* canvas) {
-//        test_strokerect(canvas); return;
-//        test_text(canvas); return;
+        if (false) { // avoid bit rot, suppress warning
+            test_strokerect(canvas);
+            return;
+        }
+        if (false) { // avoid bit rot, suppress warning
+            test_text(canvas);
+            return;
+        }
 #ifdef SK_DEBUG
         if (true) {
             SkRegion a, b, c;