Simplify plots to always be 512x512 and simplify GrDrawOpAtlasConfig

With less stressful tests.

Change-Id: I600cb728f6efca5aab87a16e71039a0ed00c47e1
Reviewed-on: https://skia-review.googlesource.com/153220
Reviewed-by: Cary Clark <caryclark@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Herb Derby <herb@google.com>
diff --git a/src/gpu/text/GrGlyphCache.cpp b/src/gpu/text/GrGlyphCache.cpp
index 4890804..933a1c0 100644
--- a/src/gpu/text/GrGlyphCache.cpp
+++ b/src/gpu/text/GrGlyphCache.cpp
@@ -42,10 +42,7 @@
 }
 
 SkScalar GrGlyphCache::ComputeGlyphSizeLimit(int maxTextureSize, size_t maxTextureBytes) {
-    int maxDim, minDim, maxPlot, minPlot;
-    GrAtlasManager::ComputeAtlasLimits(maxTextureSize, maxTextureBytes, &maxDim, &minDim, &maxPlot,
-                                       &minPlot);
-    return minPlot;
+    return SkGlyphCacheCommon::kSkSideTooBigForAtlas;
 }
 
 void GrGlyphCache::HandleEviction(GrDrawOpAtlas::AtlasID id, void* ptr) {