useCaseDefault section: Default value for predefined use cases priority hint. "fgPriority": priority when the use case is in foreground. "bgPriority": priority when the use case is in background. useCasePreDefined section: A list of predefined use cases and their foreground/background priority hint. Each use case has the following attributes: "type": type of the use case. Pre-defined use cases start with "USE_CASE_" and have been predefined in "predefinedUseCaseType". "fgPriority": priority when the use case is in foreground. "bgPriority": priority when the use case is in background. useCaseVendor section: A list of vendor defined use cases and their foreground/background priority hint. Each use case has the following attributes: "type": type of the use case. Vendor defined use cases start with "VENDOR_USE_CASE_". "fgPriority": priority when the use case is in foreground. "bgPriority": priority when the use case is in background. "id": Vendor defined use case must have an id greater than 1000 to be associated with.