27121 Roll Skia from 024668cf7f46 to d584ddd1519c (7 revisions) (cla: yes, waiting for tree to go green)

27123 Avoid capturing raw pointers to the SkPicture/DisplayList used by the RasterizeToImage draw callback (cla: yes, waiting for tree to go green, needs tests)

27124 [flow] Switch to directional shadows (cla: yes, waiting for tree to go green)

27125 Move the Android API JAR ahead of the third-party dependencies in the Javadoc classpath (cla: yes, waiting for tree to go green)

27126 Rename SkiaGPUObject::get() to skia_object() (cla: yes, waiting for tree to go green)