Provide operator<< functions so that gtest can use them to print enum
classes.
--HG--
extra : commitid : JYu6ffen2Zr
extra : rebase_source : 6628de44b343a0c625fd4526d36dba34ad0cb5cc
Remove the assert of the existence of PresShell in the constructor since
there's no PresShell in gtest. Also make AccessibleCaret inheritable.
--HG--
extra : commitid : JudUoXt9auc
extra : rebase_source : 882f017063339c2fb2313459d9a9f2f7c1549071
We want AccessibleCaret be of the same size regardless of the zoom
level. We simply divide the caret's width, height, margin-left, and the
text selection bar's margin-left by current zoom level.
The margin-left of the caret is adjusted from -23px to -23.5px for better
looking.
See AccessibleCaret.h for the class description.
Technical difference between AccessibleCaret and Touch/SelectionCarets:
The anonymous dom element containing a caret image will be created by
AccessibleCaret by using the API landed in bug 1020244 instead of being
created by nsCanvasFrame.
