Allow frames to be free'd even for static images

Source/platform/image-decoders/ImageDecoder.cpp

Index: Source/platform/image-decoders/ImageDecoder.cpp
diff --git a/Source/platform/image-decoders/ImageDecoder.cpp b/Source/platform/image-decoders/ImageDecoder.cpp
index cb5774dffc510ff6718f93165df02db3011adc39..7208311fc2e2171b3b3ff7ea6211a3a03a82640f 100644
--- a/Source/platform/image-decoders/ImageDecoder.cpp
+++ b/Source/platform/image-decoders/ImageDecoder.cpp
@@ -134,8 +134,9 @@ unsigned ImageDecoder::frameBytesAtIndex(size_t index) const
 
 size_t ImageDecoder::clearCacheExceptFrame(size_t clearExceptFrame)
 {
-    // Don't clear if there are no frames or only one frame.
-    if (m_frameBufferCache.size() <= 1)
+    // Don't clear if there are no frames or only one frame, and we're not
+    // specifically requested to clear all frames.
+    if (m_frameBufferCache.size() <= 1 && clearExceptFrame != kNotFound)
         return 0;

[Peter Kasting, 2014/01/14 00:46:18]

Nit: Can't we just implement this by removing this block entirely?  It seems
like the code below will already do what we want in this case, if only we didn't
have this condition.

[fs, 2014/01/14 08:32:09]

Yes, true. Will drop this block.

 
     size_t frameBytesCleared = 0;