wire up reduced atlas and zero textblob cache to test

src/gpu/GrTest.h

Index: src/gpu/GrTest.h
diff --git a/src/gpu/GrTest.h b/src/gpu/GrTest.h
index eb1d7de25dcb2a943cddf8ced6b0db3de55057a9..92bfb137503686e8dbcf8b41377b4d1a60fa6586 100644
--- a/src/gpu/GrTest.h
+++ b/src/gpu/GrTest.h
@@ -13,6 +13,14 @@
 #include "GrDrawTarget.h"
 #include "gl/GrGLContext.h"
 
+namespace GrTest {
+    /**
+     * Forces the GrContext to use a small atlas which only has room for one plot and will thus
+     * constantly be evicting entries
+     */
+    void SetupAlwaysEvictAtlas(GrContext*);
+};
+
 /** Allows a test to temporarily draw to a GrDrawTarget owned by a GrContext. Tests that use this
     should be careful not to mix using the GrDrawTarget directly and drawing via SkCanvas or
     GrContext. In the future this object may provide some guards to prevent this. */