Bug 1061976 - Remove background-drawing for overscrolled layers. r=BenWa, a=bajaj

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extra : rebase_source : ee05f36d60ce5a42b309cc1acbc4a819e7938f7c
Bug 1061976 - Reinstate APZ gtests for overscrolling during panning. r=BenWa, a=test-only

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extra : rebase_source : ed3f94c1fbbd350fddd78cda21fbd1a56cfab1dd
Bug 1014877 - Uncouple preview and video-recording frame sizes. r=aosmond, a=bajaj

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extra : rebase_source : 32062170f9e57145b2f1af99f9b71ab3d92e7196
Bug 1053691 - Fallback to /cache if /persist is not available. r=fabrice, a=bajaj

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extra : rebase_source : 154a9236cb22ad7e3e2e226b3102cef2257ec9c4
Bug 1068571 - Clear velocity on touch-end even if in the NOTHING state. r=botond, a=bajaj

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extra : rebase_source : 7d5daedb8a31c59794f16595201fa14ec6ad7327
Bug 1048011 - Fix a race condition that leaks PProcLoaderParent. r=khuey, a=bajaj

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extra : rebase_source : e7c7bc3b3b2bdceeaf1c4c5981541de325c81e25