Bug 969580 - Part 1: Expose DiscardAll to SurfaceCache public interface. r=seth

image/src/SurfaceCache.cpp

@@ -524,5 +524,14 @@ SurfaceCache::Discard(Image* aImageKey)
   return sInstance->Discard(aImageKey);
 }
 
+/* static */ void
+SurfaceCache::DiscardAll()
+{
+  MOZ_ASSERT(sInstance, "Should be initialized");
+  MOZ_ASSERT(NS_IsMainThread());
+
+  return sInstance->DiscardAll();
+}
+
 } // namespace image
 } // namespace mozilla

image/src/SurfaceCache.h

@@ -162,6 +162,11 @@ struct SurfaceCache
    */
   static void Discard(const ImageKey aImageKey);
 
+  /*
+   * Evicts all caches surfaces from ths cache.
+   */
+  static void DiscardAll();
+
 private:
   virtual ~SurfaceCache() = 0;  // Forbid instantiation.
 };

image/src/moz.build

@@ -10,6 +10,7 @@ EXPORTS += [
     'imgRequest.h',
     'imgRequestProxy.h',
     'Orientation.h',
+    'SurfaceCache.h'
 ]
 
 UNIFIED_SOURCES += [