49846 Have android validator suggest ANDROID_SDK_ROOT instead of deprecated ANDROID_HOME (cla: yes, tool, waiting for tree to go green)

49847 Revert “fix global key error” (cla: yes, f: cupertino, f: material design, framework)

49848 Step 3 of 4: Make AlertDialog scrollable by default (cla: yes, f: material design, framework, waiting for tree to go green)

49854 Replace ideviceinfo and idevice_id with xcdevice (cla: yes, platform-ios, tool, waiting for tree to go green)

49869 Revert “Roll engine 74d07b5f6b4f..e5209202fb00 (4 commits) (#49835)” (cla: yes, engine)