Implements a new class, SkSingleInputImageFilter, to handle DAG connectivity
for filters with a single image input.  This provides functionality to store,
flatten and unflatten a single SkImageFilter input, as well as to recursively
evaluate it on the CPU or GPU.  The following classes were re-parented to 
implement DAG connectivity:  SkBlurImageFilter, SkDilateImageFilter,
SkErodeImageFilter, SkColorFilterImageFilter.  The constructors for each
have been appended with a new parameter, representing the input filter
(default NULL).

This change also implements an arbitrary SkBitmap input source for filtering,
SkBitmapSource.

NOTE:  This CL will require gyp file changes when rolling past this revision.

Review URL:  https://codereview.appspot.com/6462071/



git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@5170 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed