I attached a patch that adds unzip and ca-certificates to Depends. The package will then install successfully. Tested in a pbuilder chroot.
diff -Nru google-android-build-tools-installer-20.0.0.1/debian/changelog google-android-build-tools-installer-20.0.0.1+nmu1/debian/changelog
--- google-android-build-tools-installer-20.0.0.1/debian/changelog 2014-09-19 04:52:22.000000000 +0200
+++ google-android-build-tools-installer-20.0.0.1+nmu1/debian/changelog 2014-11-26 00:55:58.000000000 +0100
@@ -1,3 +1,10 @@
+google-android-build-tools-installer (20.0.0.1+nmu1) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * added unzip and ca-certificates to Depends (Closes: #770597)
+
+ -- Reiner Herrmann <rei...@reiner-h.de> Wed, 26 Nov 2014 00:32:44 +0100
+
google-android-build-tools-installer (20.0.0.1) unstable; urgency=low
* add Conflicts: for non-Android packages, and Replaces: for Android ones
diff -Nru google-android-build-tools-installer-20.0.0.1/debian/control google-android-build-tools-installer-20.0.0.1+nmu1/debian/control
--- google-android-build-tools-installer-20.0.0.1/debian/control 2014-10-08 04:31:32.000000000 +0200
+++ google-android-build-tools-installer-20.0.0.1+nmu1/debian/control 2014-11-26 00:55:21.000000000 +0100
@@ -16,6 +16,8 @@
make | build-essential | dpkg-dev,
zlib1g,
libstdc++6,
+ unzip,
+ ca-certificates,
${misc:Depends},
Conflicts: aapt, zipalign, libclang-dev, dx
Replaces: aapt, zipalign
signature.asc
Description: OpenPGP digital signature
