Merge branch 'stable-2.15'
* stable-2.15:
Format all Java files with google-java-format
Fix support for Velocity and Soy comments
Use map.computeIfAbsent
Fix Eclipse warnings about raw types
Rename parameter to comply with naming convention
Replace anonymous class with ThreadLocal.withInitial
Use Logger's built-in formatting
Move array designators to the type
Clarify constant declaration
Replace FluentIterable with Java Stream
Remove unnecessary import
Avoid redundant array creation
Remove redundant specification of type arguments
Remove redundant semicolons
Apply google-java-format to all files
Change-Id: If9ba8e41f67e066973d83ac60b6a212cd4432fae
