purge imagefilter cache so we can better track leaks

src/core/SkImageFilter.cpp

Index: src/core/SkImageFilter.cpp
diff --git a/src/core/SkImageFilter.cpp b/src/core/SkImageFilter.cpp
index 0a5aca85edd2abf8a98c4f675114565f935afae0..0a5e16e1d7a54d44640a0ff86cc5c343cb4dea42 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -474,6 +474,16 @@ public:
             removeInternal(tail);
         }
     }
+
+    void purge() override {
+        SkAutoMutexAcquire mutex(fMutex);
+        while (fCurrentBytes > 0) {
+            Value* tail = fLRU.tail();
+            SkASSERT(tail);
+            this->removeInternal(tail);
+        }
+    }
+
 private:
     void removeInternal(Value* v) {
         fCurrentBytes -= v->fBitmap.getSize();
@@ -504,3 +514,7 @@ SK_DECLARE_STATIC_LAZY_PTR(SkImageFilter::Cache, cache, CreateCache);
 SkImageFilter::Cache* SkImageFilter::Cache::Get() {
     return cache.get();
 }
+
+void SkImageFilter::PurgeCache() {

[robertphillips, 2015/05/20 20:28:19]

Should this be gCache ?

+    cache.get()->purge();
+}