Automatic versioning for Camera.

  Bug: 10461009

This is the scheme copied from GMS Core and modified by Babel, which
allows us to generate version number more easily and also incorporate
build numbers into it.

Change-Id: I6ed4bf03e545a22423cb9936a5fcb67a50133490
diff --git a/version.mk b/version.mk
new file mode 100644
index 0000000..2b6077a
--- /dev/null
+++ b/version.mk
@@ -0,0 +1,98 @@
+#
+# Copyright (C) 2013 Google Inc.
+#
+
+# The version code scheme for the package apk is:
+#      Mmbbbtad
+# where
+#    M - major version (one or more digits)
+#    m - minor version (exactly 1 digit)
+#  bbb - manually specified build number (exactly 3 digits)
+#    t - build type (exactly 1 digit).  Current valid values are:
+#           0 : eng build
+#           1 : build server build
+#    a - device architecture (exactly 1 digit).  Current valid values are:
+#           0 : non-native
+#           1 : armv5te
+#           3 : armv7-a
+#           5 : mips
+#           7 : x86
+#    d - asset density (exactly 1 digit).  Current valid values are:
+#           0 : all densities
+#           2 : mdpi
+#           4 : hdpi
+#           6 : xhdpi
+# Mmbbb is specified manually.  tad is automatically set during the build.
+#
+# For the client jar, the version code is agnostic to the target architecture and density: Mmbbbt00
+#
+# NOTE: arch needs to be more significant than density because x86 devices support running ARM
+# code in emulation mode, so all x86 versions must be higher than all ARM versions to ensure
+# we deliver true x86 code to those devices.
+
+# Specify the following manually.  Note that base_version_minor must be exactly 1 digit and
+# base_version_build must be exactly 3 digits.
+base_version_major := 2
+base_version_minor := 0
+base_version_build := 001
+
+#####################################################
+#####################################################
+# Collect automatic version code parameters
+ifneq "" "$(filter eng.%,$(BUILD_NUMBER))"
+  # This is an eng build
+  base_version_buildtype := 0
+else
+  # This is a build server build
+  base_version_buildtype := 1
+endif
+
+ifeq "$(TARGET_ARCH)" "x86"
+  base_version_arch := 7
+else ifeq "$(TARGET_ARCH)" "mips"
+  base_version_arch := 5
+else ifeq "$(TARGET_ARCH)" "arm"
+  ifeq ($(TARGET_ARCH_VARIANT),armv5te)
+    base_version_arch := 1
+  else
+    base_version_arch := 3
+  endif
+else
+  base_version_arch := 0
+endif
+
+ifeq "$(package_dpi)" "mdpi"
+  base_version_density := 2
+else ifeq "$(package_dpi)" "hdpi"
+  base_version_density := 4
+else ifeq "$(package_dpi)" "xhdpi"
+  base_version_density := 6
+else
+  base_version_density := 0
+endif
+
+# Build the version code
+version_code_package := $(base_version_major)$(base_version_minor)$(base_version_build)$(base_version_buildtype)$(base_version_arch)$(base_version_density)
+
+# The version name scheme for the package apk is:
+# - For eng build (t=0):     M.m.bbb eng.$(USER)-hh
+# - For build server (t=1):  M.m.bbb (nnnnnn-hh)
+#       where nnnnnn is the build number from the build server (no zero-padding)
+# On eng builds, the BUILD_NUMBER has the user and timestamp inline
+ifneq "" "$(filter eng.%,$(BUILD_NUMBER))"
+  git_hash := $(shell git --git-dir $(LOCAL_PATH)/.git log -n 1 --pretty=format:%h)
+  date_string := $(shell date +%m%d%y_%H%M%S)
+  version_name_package := $(base_version_major).$(base_version_minor).$(base_version_build) (eng.$(USER).$(git_hash).$(date_string)-$(base_version_arch)$(base_version_density))
+else
+  version_name_package := $(base_version_major).$(base_version_minor).$(base_version_build) ($(BUILD_NUMBER)-$(base_version_arch)$(base_version_density))
+endif
+
+# Cleanup the locals
+base_version_major :=
+base_version_minor :=
+base_version_build :=
+base_version_buildtype :=
+base_version_arch :=
+base_version_density :=
+git_hash :=
+date_string :=