add SkGraphics::PurageAllCaches

include/core/SkGraphics.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkGraphics_DEFINED
 #define SkGraphics_DEFINED
 
@@ skipping 102 matching lines @@
     static size_t GetResourceCacheSingleAllocationByteLimit();
     static size_t SetResourceCacheSingleAllocationByteLimit(size_t newLimit);
 
     /**
      *  Dumps memory usage of caches using the SkTraceMemoryDump interface. See SkTraceMemoryDump
      *  for usage of this method.
      */
     static void DumpMemoryStatistics(SkTraceMemoryDump* dump);
 
     /**
+     *  Free as much globally cached memory as possible. This will purge all private caches in Skia,
+     *  including font and image caches.
+     *
+     *  If there are caches associated with GPU context, those will not be affected by this call.
+     */
+    static void PurgeAllCaches();
+
+    /**
      *  Applications with command line options may pass optional state, such
      *  as cache sizes, here, for instance:
      *  font-cache-limit=12345678
      *
      *  The flags format is name=value[;name=value...] with no spaces.
      *  This format is subject to change.
      */
     static void SetFlags(const char* flags);
 
     /**
@@ skipping 30 matching lines @@
 };
 
 class SkAutoGraphics {
 public:
     SkAutoGraphics() {
         SkGraphics::Init();
     }
 };
 
 #endif