Add abliity to set textblob cache budget to GrContext

src/gpu/GrTextBlobCache.h

Index: src/gpu/GrTextBlobCache.h
diff --git a/src/gpu/GrTextBlobCache.h b/src/gpu/GrTextBlobCache.h
index 4c9cb14000e7c1642177bea8b185bc37898e4ac7..14e6e3cdad973923da2364a716693c9c1a915d10 100644
--- a/src/gpu/GrTextBlobCache.h
+++ b/src/gpu/GrTextBlobCache.h
@@ -23,7 +23,8 @@ public:
     GrTextBlobCache(PFOverBudgetCB cb, void* data)
         : fPool(kPreAllocSize, kMinGrowthSize)
         , fCallback(cb)
-        , fData(data) {
+        , fData(data)
+        , fBudget(kDefaultBudget) {
         SkASSERT(cb && data);
     }
     ~GrTextBlobCache();
@@ -82,12 +83,12 @@ public:
         fBlobList.addToHead(blob);
 
         // If we are overbudget, then unref until we are below budget again
-        if (fPool.size() > kBudget) {
+        if (fPool.size() > fBudget) {
             BitmapBlobList::Iter iter;
             iter.init(fBlobList, BitmapBlobList::Iter::kTail_IterStart);
             GrAtlasTextBlob* lruBlob = iter.get();
             SkASSERT(lruBlob);
-            while (fPool.size() > kBudget && (lruBlob = iter.get()) && lruBlob != blob) {
+            while (fPool.size() > fBudget && (lruBlob = iter.get()) && lruBlob != blob) {
                 fCache.remove(lruBlob->fKey);
 
                 // Backup the iterator before removing and unrefing the blob
@@ -103,8 +104,8 @@ public:
                 (*fCallback)(fData);
             }
 
-#ifdef SK_DEBUG
-            if (fPool.size() > kBudget) {
+#ifdef SPEW_BUDGET_MESSAGE
+            if (fPool.size() > fBudget) {
                 SkDebugf("Single textblob is larger than our whole budget");
             }
 #endif
@@ -130,6 +131,8 @@ public:
         }
     }
 
+    void setBudget(size_t budget) { fBudget = budget; }
+
 private:
     typedef SkTInternalLList<GrAtlasTextBlob> BitmapBlobList;
 
@@ -137,12 +140,13 @@ private:
     // based off of the largest cached textblob I have seen in the skps(a couple of kilobytes).
     static const int kPreAllocSize = 1 << 17;
     static const int kMinGrowthSize = 1 << 17;
-    static const int kBudget = 1 << 22;
+    static const int kDefaultBudget = 1 << 22;
     BitmapBlobList fBlobList;
     SkTDynamicHash<GrAtlasTextBlob, GrAtlasTextBlob::Key> fCache;
     GrMemoryPool fPool;
     PFOverBudgetCB fCallback;
     void* fData;
+    size_t fBudget;
 };
 
 #endif