Abstract OSMesa from the Layout tests

content/public/test/browser_test_base.h

Index: content/public/test/browser_test_base.h
diff --git a/content/public/test/browser_test_base.h b/content/public/test/browser_test_base.h
index fa14d40fcce454ad576c12492533e74964668c2c..e7e3604d675d1e524d56b9960bacb4f7eafe44d1 100644
--- a/content/public/test/browser_test_base.h
+++ b/content/public/test/browser_test_base.h
@@ -121,8 +121,9 @@ class BrowserTestBase : public testing::Test {
   // instead.
   void UseSoftwareCompositing();
 
-  // Returns true if the test will be using GL acceleration via OSMesa.
-  bool UsingOSMesa() const;
+  // Returns true if the test will be using GL acceleration via a software
+  // renderer.
+  bool UsingSoftwareRenderer() const;

[jbauman, 2017/02/15 00:43:48]

Maybe call this UsingSoftwareGL() instead. Otherwise it's easy to confuse this
with  UseSoftwareCompositing() above.

[Ken Russell (switch to Gerrit), 2017/02/15 02:32:15]

+1 to John's suggestion.

 
  private:
   void ProxyRunTestOnMainThreadLoop();