Turn on -Wall -Wextra on Mac, and fix all the warnings that crop up for /usr/bin/g++ and Clang 3.3.
BUG=
R=bungeman@google.com

Author: mtklein@google.com

Review URL: https://chromiumcodereview.appspot.com/19569012

git-svn-id: http://skia.googlecode.com/svn/trunk@10255 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/SkLayer.cpp b/src/utils/SkLayer.cpp
index a96d921..126dd92 100644
--- a/src/utils/SkLayer.cpp
+++ b/src/utils/SkLayer.cpp
@@ -36,7 +36,7 @@
 #endif
 }
 
-SkLayer::SkLayer(const SkLayer& src) {
+SkLayer::SkLayer(const SkLayer& src) : INHERITED() {
     fParent = NULL;
     m_opacity = src.m_opacity;
     m_size = src.m_size;