Build the protocol buffer compiler 'protoc'.
Build the protocol buffer compiler 'protoc'.

We need this to generate code for .proto files that have
been added to external/chromium (see change I6960c18d).

Change-Id: Ic7a78273ee4f066680039d2f724e658a84869621

google/protobuf,google/protobuf,google/protobuf,google/protobuf,google/protobuf,Livefyre/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf,google/protobuf,google/protobuf,Livefyre/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf,Livefyre/protobuf