Merge changes I4bf40d49,I8c1b82f0,I6128b520,Icf1428e3,I44704847, ... into mnc-ub-dev

* changes:
  Merge "docs: Enhanced description of "direct reply" workflow." into mnc-mr-docs am: 4a17d8f8 am: a9738fed
  Merge "doc: Update N Preview release notes for DP2." into mnc-mr-docs am: 5f8bdb9f am: 1ccba999
  Merge "docs: Updates to API Overview for N Preview 2" into mnc-mr-docs am: f2e37dae am: 9dc17619
  docs: Updating Android for Work N Preview page for DP2. am: 7037a86e am: acb8d484
  Merge "docs: Fixed "known issues" link." into mnc-mr-docs am: 464d3d6b am: 69f2aba6
  Merge "Docs: Behavior Changes doc for N Developer Preview 2" into mnc-mr-docs am: c79b6ecb am: fc7b97b0
  Merge "docs: Clarified structure of security config file." into mnc-mr-docs am: c3cada0a am: 0e6f90e4
  Merge "Word the section about libc++ more strongly." into mnc-mr-docs am: 021c306e am: de5da71a
  Merge "new doc about shrinking code and resources (massive re-write of proguard doc). bug: 27746083" into mnc-mr-docs am: 01d3063f am: 7ceca13f
  Merge "docs: Added resource card to AdMob Ads page in DAC" into mnc-mr-docs am: 7ba3c05d am: 7a084e1f
  Merge "docs: Fixed capitalization error in method name." into mnc-mr-docs am: 09fab6dc am: 36223fad
  Merge "docs: Updated link, wording associated with data-sharing IPC." into mnc-mr-docs am: c501688c am: 7bce49c5
  Merge "docs: Fixed "APK signature scheme v2" link in N API Overview." into mnc-mr-docs am: e84d9cea am: 6d683d20
  Merge "Docs: Android Plugin DSL Ref 2.0.0 was just published. Added some useful links." into mnc-mr-docs am: 80202c02 am: a1b59e12
  Merge "docs: Updates to Multi-Window/PiP APIs for Preview 2" into mnc-mr-docs am: bd7c1b4d am: 194c1e60
  Merge "docs: InfoPros, Project 02, Batch 03" into mnc-mr-docs am: d00f0050 am: 94e52371
  docs: Remove texture compression formats that don\'t exist am: 2112afe7 am: 8d949de2
  Merge "Clarified how to regenerate debug.keystore" into mnc-mr-docs am: 1452c87b am: 98a02c0b
  Merge "docs: Updating PIP N preview docs for DP2" into mnc-mr-docs am: f5b6b18a am: e7a6e439
  Merge "docs: Updating Scoped Directory Access preview docs for DP2" into mnc-mr-docs am: bc90f38e am: d77a4db2
  Merge "docs: Updating Direct Boot N preview docs for DP2" into mnc-mr-docs am: 69f6e5b0 am: 3aa606f7