DO NOT COMMIT: Experimental removal of encoded image data

third_party/WebKit/Source/platform/graphics/BitmapImage.cpp

Index: third_party/WebKit/Source/platform/graphics/BitmapImage.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/BitmapImage.cpp b/third_party/WebKit/Source/platform/graphics/BitmapImage.cpp
index 9f29f85aaeb796b88454c0a80e4bfe5811f8bddc..0e2499801f2f64f0d8ab97072dd6a65f087e1611 100644
--- a/third_party/WebKit/Source/platform/graphics/BitmapImage.cpp
+++ b/third_party/WebKit/Source/platform/graphics/BitmapImage.cpp
@@ -118,6 +118,12 @@ void BitmapImage::destroyDecodedData()
     notifyMemoryChanged();
 }
 
+bool BitmapImage::clear()
+{
+    destroyDecodedData();
+    return m_source.clear();
+}
+
 PassRefPtr<SharedBuffer> BitmapImage::data()
 {
     return m_source.data();
@@ -344,6 +350,11 @@ sk_sp<SkImage> BitmapImage::frameAtIndex(size_t index)
     if (index == m_cachedFrameIndex && m_cachedFrame)
         return m_cachedFrame;
 
+    if (m_source.isBufferCleared()) {
+        getImageObserver()->requireReloading(this);
+        return nullptr;
+    }
+
     return decodeAndCacheFrame(index);
 }