The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/bc8994de1b388e468d8b1240d6b150d313fd84d9

commit bc8994de1b388e468d8b1240d6b150d313fd84d9
Author: hashimoto <hashimoto@chromium.org>
Date: Wed Oct 12 04:25:33 2016

Add ARC contents filesystem type

This filesystem type will be used to support ARC contents with externalfile: URL.
Chrome will be able to use externalfile: URLs to access ARC contents.

BUG= 654684 

Review-Url: https://codereview.chromium.org/2405193002
Cr-Commit-Position: refs/heads/master@{#424666}

[modify] https://crrev.com/bc8994de1b388e468d8b1240d6b150d313fd84d9/storage/browser/fileapi/file_system_context.cc
[modify] https://crrev.com/bc8994de1b388e468d8b1240d6b150d313fd84d9/storage/common/fileapi/file_system_types.h
[modify] https://crrev.com/bc8994de1b388e468d8b1240d6b150d313fd84d9/storage/common/fileapi/file_system_util.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f506bdfec37f2e79353169d874b1eb8fbf155873

commit f506bdfec37f2e79353169d874b1eb8fbf155873
Author: hashimoto <hashimoto@chromium.org>
Date: Thu Oct 13 15:12:24 2016

arc: Empty implementation of ARC content file system

Actual implementation will be added later.

BUG= 654684 

Review-Url: https://codereview.chromium.org/2411323002
Cr-Commit-Position: refs/heads/master@{#425034}

[modify] https://crrev.com/f506bdfec37f2e79353169d874b1eb8fbf155873/chrome/browser/chromeos/BUILD.gn
[add] https://crrev.com/f506bdfec37f2e79353169d874b1eb8fbf155873/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_async_file_util.cc
[add] https://crrev.com/f506bdfec37f2e79353169d874b1eb8fbf155873/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_async_file_util.h
[add] https://crrev.com/f506bdfec37f2e79353169d874b1eb8fbf155873/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_backend_delegate.cc
[add] https://crrev.com/f506bdfec37f2e79353169d874b1eb8fbf155873/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_backend_delegate.h
[add] https://crrev.com/f506bdfec37f2e79353169d874b1eb8fbf155873/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_file_stream_reader.cc
[add] https://crrev.com/f506bdfec37f2e79353169d874b1eb8fbf155873/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_file_stream_reader.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b94e929572960bae4c96de14342e9a5efc2d0995

commit b94e929572960bae4c96de14342e9a5efc2d0995
Author: hashimoto <hashimoto@chromium.org>
Date: Fri Oct 21 03:53:47 2016

arc: Add URL converter functions

When receiving a content: URL or a file: URL from ARC,
these functions will be used to convert the URL to an externalfile: URL
to display the contents on a Chrome tab.

BUG= 654684 

Review-Url: https://chromiumcodereview.appspot.com/2437693002
Cr-Commit-Position: refs/heads/master@{#426724}

[modify] https://crrev.com/b94e929572960bae4c96de14342e9a5efc2d0995/chrome/browser/chromeos/BUILD.gn
[add] https://crrev.com/b94e929572960bae4c96de14342e9a5efc2d0995/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util.cc
[add] https://crrev.com/b94e929572960bae4c96de14342e9a5efc2d0995/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util.h
[add] https://crrev.com/b94e929572960bae4c96de14342e9a5efc2d0995/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util_unittest.cc
[modify] https://crrev.com/b94e929572960bae4c96de14342e9a5efc2d0995/chrome/browser/chromeos/fileapi/external_file_url_util.cc
[modify] https://crrev.com/b94e929572960bae4c96de14342e9a5efc2d0995/chrome/browser/chromeos/fileapi/external_file_url_util.h
[modify] https://crrev.com/b94e929572960bae4c96de14342e9a5efc2d0995/chrome/browser/chromeos/fileapi/external_file_url_util_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a53e7e8054ac086bec20a1c77b543b204d57ba90

commit a53e7e8054ac086bec20a1c77b543b204d57ba90
Author: hashimoto <hashimoto@chromium.org>
Date: Wed Oct 26 06:30:47 2016

arc: Register ARC content file system

Add ARC delegate to chromeos::FileSystemBackend.
Add ARC content file system as an external file URL type.
Add ArcContentFileSystemService which is responsible to register the file system.

File system implementation (in chrome/browser/chromeos/arc/fileapi) is empty yet.
It'll be added later.

BUG= 654684 
TBR=sky@chromium.org for platform_util_unittest.cc

Review-Url: https://codereview.chromium.org/2450713002
Cr-Commit-Position: refs/heads/master@{#427609}

[modify] https://crrev.com/a53e7e8054ac086bec20a1c77b543b204d57ba90/chrome/browser/chrome_content_browser_client.cc
[modify] https://crrev.com/a53e7e8054ac086bec20a1c77b543b204d57ba90/chrome/browser/chromeos/BUILD.gn
[modify] https://crrev.com/a53e7e8054ac086bec20a1c77b543b204d57ba90/chrome/browser/chromeos/arc/arc_service_launcher.cc
[add] https://crrev.com/a53e7e8054ac086bec20a1c77b543b204d57ba90/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_service.cc
[add] https://crrev.com/a53e7e8054ac086bec20a1c77b543b204d57ba90/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_service.h
[modify] https://crrev.com/a53e7e8054ac086bec20a1c77b543b204d57ba90/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util.cc
[modify] https://crrev.com/a53e7e8054ac086bec20a1c77b543b204d57ba90/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util.h
[modify] https://crrev.com/a53e7e8054ac086bec20a1c77b543b204d57ba90/chrome/browser/chromeos/fileapi/external_file_url_util.cc
[modify] https://crrev.com/a53e7e8054ac086bec20a1c77b543b204d57ba90/chrome/browser/chromeos/fileapi/file_system_backend.cc
[modify] https://crrev.com/a53e7e8054ac086bec20a1c77b543b204d57ba90/chrome/browser/chromeos/fileapi/file_system_backend.h
[modify] https://crrev.com/a53e7e8054ac086bec20a1c77b543b204d57ba90/chrome/browser/chromeos/fileapi/file_system_backend_unittest.cc
[modify] https://crrev.com/a53e7e8054ac086bec20a1c77b543b204d57ba90/chrome/browser/platform_util_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6f10b685c5aa13623e76e101e5f22e6b164221d7

commit 6f10b685c5aa13623e76e101e5f22e6b164221d7
Author: hashimoto <hashimoto@chromium.org>
Date: Sun Nov 06 04:57:17 2016

arc: Add methods to IntentHelperInstance to read ARC contents

BUG= 654684 

Review-Url: https://codereview.chromium.org/2469963003
Cr-Commit-Position: refs/heads/master@{#430185}

[modify] https://crrev.com/6f10b685c5aa13623e76e101e5f22e6b164221d7/components/arc/common/intent_helper.mojom
[modify] https://crrev.com/6f10b685c5aa13623e76e101e5f22e6b164221d7/components/arc/test/fake_intent_helper_instance.cc
[modify] https://crrev.com/6f10b685c5aa13623e76e101e5f22e6b164221d7/components/arc/test/fake_intent_helper_instance.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2eb325852a4e5e6509de26200b35be3ff85f8c27

commit 2eb325852a4e5e6509de26200b35be3ff85f8c27
Author: hashimoto <hashimoto@chromium.org>
Date: Tue Nov 08 21:51:48 2016

arc: Make IntentHelper::OpenFileToRead's return value nullable

Version number is not changed as this method has not been implemented by
Android side yet.

BUG= 654684 

Review-Url: https://codereview.chromium.org/2485043003
Cr-Commit-Position: refs/heads/master@{#430726}

[modify] https://crrev.com/2eb325852a4e5e6509de26200b35be3ff85f8c27/components/arc/common/intent_helper.mojom

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2eb325852a4e5e6509de26200b35be3ff85f8c27

commit 2eb325852a4e5e6509de26200b35be3ff85f8c27
Author: hashimoto <hashimoto@chromium.org>
Date: Tue Nov 08 21:51:48 2016

arc: Make IntentHelper::OpenFileToRead's return value nullable

Version number is not changed as this method has not been implemented by
Android side yet.

BUG= 654684 

Review-Url: https://codereview.chromium.org/2485043003
Cr-Commit-Position: refs/heads/master@{#430726}

[modify] https://crrev.com/2eb325852a4e5e6509de26200b35be3ff85f8c27/components/arc/common/intent_helper.mojom

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e1c72209b2babf55ccd41247330e2ec18caa85df

commit e1c72209b2babf55ccd41247330e2ec18caa85df
Author: hashimoto <hashimoto@chromium.org>
Date: Fri Nov 11 00:45:43 2016

arc: Add utility functions to implement ARC content file system

Add intent_helper_util to use IntentHelperInstance from IO thread.
Add FileSystemUrlToArcUrl and a test for it.

BUG= 654684 
TEST=unit_tests

Review-Url: https://codereview.chromium.org/2464333003
Cr-Commit-Position: refs/heads/master@{#431425}

[modify] https://crrev.com/e1c72209b2babf55ccd41247330e2ec18caa85df/chrome/browser/chromeos/BUILD.gn
[modify] https://crrev.com/e1c72209b2babf55ccd41247330e2ec18caa85df/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util.cc
[modify] https://crrev.com/e1c72209b2babf55ccd41247330e2ec18caa85df/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util.h
[modify] https://crrev.com/e1c72209b2babf55ccd41247330e2ec18caa85df/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util_unittest.cc
[add] https://crrev.com/e1c72209b2babf55ccd41247330e2ec18caa85df/chrome/browser/chromeos/arc/fileapi/intent_helper_util.cc
[add] https://crrev.com/e1c72209b2babf55ccd41247330e2ec18caa85df/chrome/browser/chromeos/arc/fileapi/intent_helper_util.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6a0588e6e5569b64f03785920897fda2bea93ec2

commit 6a0588e6e5569b64f03785920897fda2bea93ec2
Author: hashimoto <hashimoto@chromium.org>
Date: Fri Nov 11 02:58:45 2016

arc: Implement ArcContentFileSystemAsyncFileUtil::GetFileInfo

BUG= 654684 
TEST=unit_tests

Review-Url: https://codereview.chromium.org/2469243002
Cr-Commit-Position: refs/heads/master@{#431474}

[modify] https://crrev.com/6a0588e6e5569b64f03785920897fda2bea93ec2/chrome/browser/chromeos/BUILD.gn
[modify] https://crrev.com/6a0588e6e5569b64f03785920897fda2bea93ec2/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_async_file_util.cc
[add] https://crrev.com/6a0588e6e5569b64f03785920897fda2bea93ec2/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_async_file_util_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/913e7e3d63caa7302c32e9e3bfd61d79a70446a8

commit 913e7e3d63caa7302c32e9e3bfd61d79a70446a8
Author: hashimoto <hashimoto@chromium.org>
Date: Mon Nov 14 23:55:32 2016

arc: Implement ArcContentFileSystemFileStreamReader::Read/GetLength

Non-zero offset handling will be implemented later.

BUG= 654684 
TEST=unit_tests

Review-Url: https://codereview.chromium.org/2470843004
Cr-Commit-Position: refs/heads/master@{#431992}

[modify] https://crrev.com/913e7e3d63caa7302c32e9e3bfd61d79a70446a8/chrome/browser/chromeos/BUILD.gn
[modify] https://crrev.com/913e7e3d63caa7302c32e9e3bfd61d79a70446a8/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_backend_delegate.cc
[modify] https://crrev.com/913e7e3d63caa7302c32e9e3bfd61d79a70446a8/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_file_stream_reader.cc
[modify] https://crrev.com/913e7e3d63caa7302c32e9e3bfd61d79a70446a8/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_file_stream_reader.h
[add] https://crrev.com/913e7e3d63caa7302c32e9e3bfd61d79a70446a8/chrome/browser/chromeos/arc/fileapi/arc_content_file_system_file_stream_reader_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4fd6d1e812d0848c8cf817da160664e548ba3a87

commit 4fd6d1e812d0848c8cf817da160664e548ba3a87
Author: hashimoto <hashimoto@chromium.org>
Date: Wed Nov 16 07:16:02 2016

arc: Convert content: and file: URLs from ARC to externalfile: URLs

BUG= 654684 

Review-Url: https://codereview.chromium.org/2464333004
Cr-Commit-Position: refs/heads/master@{#432415}

[modify] https://crrev.com/4fd6d1e812d0848c8cf817da160664e548ba3a87/chrome/browser/ui/ash/chrome_shell_delegate.cc

How to test:
 1. Prepare a PDF file under Downloads directory.
 2. Launch Android's Settings app.
 3. Storage -> Explore -> Download
 4. Open the PDF file with Chrome.

Hi. I checked externalfile access on R59.
When access by setting app, the function is working well.

However when i open some image file from android file manager app, i can only see broken text string in chrome browser.

Please see attached capture file.
Thanks.

Deleted: Screenshot 2017-06-23 at 5.00.31 PM.png 714 KB

	Screenshot 2017-06-23 at 5.00.31 PM.png 714 KB View Download

ehdeoddl@, thank you for reporting.
It seems the issue is same as  issue 704701  which is fixed in M61.
Please wait for your device to get updated to M61.

hashimoto@, Thanks for fast and kild reply.
I confirm that this issue is fixed in R61

Thkans!