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Previously, boolean PolicyValue is missing a constructor with type
specification on PolicyValue class. It caused some inconvenience
on code generation and testing. With the introduction of enum
PolicyValue, this becomes more obvious because enum type's constructor
also comes with a type parameter.

In order to simplify the codegen and testing logic, this CL adds a dummy
constructor for boolean type PolicyValue.

Note: the constructor with type parameter aims to distinguish policy
values that have same C++ type representation but different policy value
type, e.g. IncDouble and DecDouble, Enum and Int.

Change-Id: I11ba793c73a770d7211e21c6a94d29f5557ac284
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2347365
Commit-Queue: Charlie Hu <chenleihu@google.com>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798714}