Gyp flag to disable inlining.

To turn off all inlining, rebuild after running the command

$ GYP_DEFINES=skia_disable_inlining=1 ./gyp_skia

Provides an initial value in one GM to avoid an uninitialized variable warning.

BUG=skia:2126
R=scroggo@google.com, mtklein@google.com, tomhudson@google.com

Author: tomhudson@chromium.org

Review URL: https://codereview.chromium.org/163363004

git-svn-id: http://skia.googlecode.com/svn/trunk@13437 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/shadertext2.cpp b/gm/shadertext2.cpp
index e8a4c6d..dcff3c6 100644
--- a/gm/shadertext2.cpp
+++ b/gm/shadertext2.cpp
@@ -149,7 +149,7 @@
         for (int s = 0; s < 2; ++s) {
             SkPaint& paint = s ? strokePaint : fillPaint;
 
-            SkScalar columnH;
+            SkScalar columnH = 0;
             for (int m = 0; m < matrices.count(); ++m) {
                 columnH = 0;
                 canvas->save();