Update tools/format

This Cl updates tools/format to match the various Dawn extensions and to
use the `clang_format.py` file from depot_tools instead of the one from
clang. This fixes up some formatting differences so `tools/format` will
now match `git cl format`.

Bug: dawn:1339
Change-Id: I32a2cdbd2d7e950794268616fae38b5bf54ab370
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/86874
Auto-Submit: Dan Sinclair <dsinclair@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
diff --git a/tools/format b/tools/format
index d0c9c64..d6de133 100755
--- a/tools/format
+++ b/tools/format
@@ -13,7 +13,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-find src -name "*.h"  -exec clang-format -i {} \;
-find src -name "*.cc"  -exec clang-format -i {} \;
-find src/tint/cmd -name "*.h"  -exec clang-format -i {} \;
-find src/tint/cmd -name "*.cc"  -exec clang-format -i {} \;
+find src -name "*.h"  -exec clang_format.py -i {} \;
+find src -name "*.cc"  -exec clang_format.py -i {} \;
+find src -name "*.cpp"  -exec clang_format.py -i {} \;
+find src -name "*.m"  -exec clang_format.py -i {} \;
+find src -name "*.mm"  -exec clang_format.py -i {} \;
+find include -name "*.h"  -exec clang_format.py -i {} \;