wire up reduced atlas and zero textblob cache to test

src/gpu/GrTest.cpp

Index: src/gpu/GrTest.cpp
diff --git a/src/gpu/GrTest.cpp b/src/gpu/GrTest.cpp
index a2efb4829beee513b07ff84a46dcdc655e16aa50..2b03238ab4f9a3384b460948b67b59de0851cf17 100644
--- a/src/gpu/GrTest.cpp
+++ b/src/gpu/GrTest.cpp
@@ -8,6 +8,7 @@
 
 #include "GrTest.h"
 
+#include "GrBatchAtlas.h"
 #include "GrBatchFontCache.h"
 #include "GrBufferedDrawTarget.h"
 #include "GrContextOptions.h"
@@ -16,6 +17,31 @@
 #include "GrTextBlobCache.h"
 #include "SkString.h"
 
+namespace GrTest {
+void SetupAlwaysEvictAtlas(GrContext* context) {
+    // These sizes were selected because they allow each atlas to hold a single plot and will thus
+    // stress the atlas
+    int dim = GrBatchAtlas::kGlyphMaxDim;
+    GrBatchAtlasConfig configs[3];
+    configs[kA8_GrMaskFormat].fWidth = dim;
+    configs[kA8_GrMaskFormat].fHeight = dim;
+    configs[kA8_GrMaskFormat].fPlotWidth = dim;
+    configs[kA8_GrMaskFormat].fPlotHeight = dim;
+
+    configs[kA565_GrMaskFormat].fWidth = dim;
+    configs[kA565_GrMaskFormat].fHeight = dim;
+    configs[kA565_GrMaskFormat].fPlotWidth = dim;
+    configs[kA565_GrMaskFormat].fPlotHeight = dim;
+
+    configs[kARGB_GrMaskFormat].fWidth = dim;
+    configs[kARGB_GrMaskFormat].fHeight = dim;
+    configs[kARGB_GrMaskFormat].fPlotWidth = dim;
+    configs[kARGB_GrMaskFormat].fPlotHeight = dim;
+
+    context->setTextContextAtlasSizes_ForTesting(configs);
+}
+};
+
 void GrTestTarget::init(GrContext* ctx, GrDrawTarget* target) {
     SkASSERT(!fContext);