Add Android fonts to blimp engine

blimp/docs/fonts.md

+# Updating Blimp Fonts
+
+1.  Clone the git-repositories listed in `//blimp/fonts/README.chromium`, and
+    roll forward to the commit you want.
+1.  Copy the necessary files to `//blimp/fonts`.
+1.  Verify that the `LICENSE` file is still up to date and lists all relevant
+    licenses and which fonts use which license.
+1.  Update the `//blimp/fonts:fonts` target to include all the current fonts and
+    their license files.
+1.  Update the engine dependencies using
+    `//blimp/tools/generate-engine-manifest.py`. This step is documented in
+    `//blimp/docs/container.md`.
+1.  Run the `upload_to_google_storage.py` (from depot_tools) script to upload
+    the files. To do this, execute:
+
+    ```bash
+    find ./blimp/fonts -regex '^.*.\(ttf\|otf\)$' -type f -print0 | \
+        upload_to_google_storage.py --use_null_terminator -b chromium-fonts -
+    ```
+
+    If the set of fonts includes more than `.ttf` or `.otf` files, you must
+    update the regular expression to include such fonts.
+1.  Verify that `//blimp/fonts/.gitignore` lists the correct files to ignore.
+1.  Add all the `.sha1` files to the chromium src repository, by executing the
+    following command:
+
+    ```bash
+    git add ./blimp/fonts/*.sha1
+    ```
+
+1.  Commit and upload the change for review:
+
+    ```bash
+    git commit
+    git cl upload
+    ```