[Media Intent Handler] Add video/3gpp to supported MIME types

This fixes an issue where Chrome will only download a video/3gpp file
instead of playing it when opened with Chrome.

Bug: 910658, 923081
Change-Id: I0fcdfe5952f0020c35fe09a0db85a4e83fe4d37a
Reviewed-on: https://chromium-review.googlesource.com/c/1437720Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626310}

media/base/mime_util_internal.cc

@@ -352,6 +352,10 @@ void MimeUtil::AddSupportedMediaFormats() {
   AddContainerWithCodecs("audio/x-m4a", aac);
   AddContainerWithCodecs("video/x-m4v", avc_and_aac);
 
+  CodecSet video_3gpp_codecs(aac);
+  video_3gpp_codecs.emplace(H264);
+  AddContainerWithCodecs("video/3gpp", video_3gpp_codecs);
+
 #if BUILDFLAG(ENABLE_MSE_MPEG2TS_STREAM_PARSER)
   CodecSet mp2t_codecs{H264, MPEG2_AAC, MPEG4_AAC, MP3};
   AddContainerWithCodecs("video/mp2t", mp2t_codecs);

media/base/mime_util_unittest.cc

@@ -184,6 +184,7 @@ TEST(MimeUtilTest, CommonMediaMimeType) {
   EXPECT_TRUE(IsSupportedMediaMimeType("audio/x-m4a"));
   EXPECT_TRUE(IsSupportedMediaMimeType("video/x-m4v"));
   EXPECT_TRUE(IsSupportedMediaMimeType("audio/aac"));
+  EXPECT_TRUE(IsSupportedMediaMimeType("video/3gpp"));
 
 #if BUILDFLAG(ENABLE_MSE_MPEG2TS_STREAM_PARSER)
   EXPECT_TRUE(IsSupportedMediaMimeType("video/mp2t"));
@@ -195,6 +196,7 @@ TEST(MimeUtilTest, CommonMediaMimeType) {
   EXPECT_FALSE(IsSupportedMediaMimeType("audio/x-m4a"));
   EXPECT_FALSE(IsSupportedMediaMimeType("video/x-m4v"));
   EXPECT_FALSE(IsSupportedMediaMimeType("audio/aac"));
+  EXPECT_FALSE(IsSupportedMediaMimeType("video/3gpp"));
 #endif  // USE_PROPRIETARY_CODECS
   EXPECT_FALSE(IsSupportedMediaMimeType("video/mp3"));