This commit adds a CapturedBufferState which is used to record all the operations
that are necessary for preparing the buffers. The commands are then instantly
executed to preserve the same behavior, but in the following commit they will
be dispatched to the paint thread.
Note: RotatedBuffer's aren't thread safe and so a shallow copy needs to be made
for sending to the paint thread. This complicates the code for AdjustTo as it can
fail naturally and the buffer parameter changes are needed later in BeginPaint.
So the code for AdjustTo is split up a bit to accomodate that.
MozReview-Commit-ID: FwSwFay887o
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extra : rebase_source : 70dd8a055aaa13586810030978409d1a89c39081
extra : intermediate-source : f235b12eda6efe0bdec8e6590d813738f53ffe82
extra : source : cb6507b560aaad188fc83a47b664aaa5692a0acd
cc9ba81109