Merge 109171 - [chromium] Inform v8 about extra memory used for PatternSkia clamp mode

Merge 109171 - [chromium] Inform v8 about extra memory used for PatternSkia clamp mode
https://bugs.webkit.org/show_bug.cgi?id=79846

Reviewed by James Robinson.

For large images, creating a non-repeating Pattern in Skia can
allocate a lot of memory. Inform v8 about this so that it can
potentially garbage collect any Pattern objects that aren't being used
and that are holding onto large image copies.

* platform/graphics/Pattern.cpp:
(WebCore::Pattern::Pattern):
* platform/graphics/Pattern.h:
(Pattern):
* platform/graphics/skia/PatternSkia.cpp:
(WebCore::Pattern::platformDestroy):
(WebCore::Pattern::platformPattern):

TBR=enne@google.com
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=109774