mojo leveldb: Get profile and leveldb connected to DOMStorageContext.

content/browser/mojo/mojo_shell_context.cc

Index: content/browser/mojo/mojo_shell_context.cc
diff --git a/content/browser/mojo/mojo_shell_context.cc b/content/browser/mojo/mojo_shell_context.cc
index 31f449aec51726fefed10b822d0ef210d6b04a46..5f65ef8d5fdcb92aa0ca34bd0335f35d90f4dcf5 100644
--- a/content/browser/mojo/mojo_shell_context.cc
+++ b/content/browser/mojo/mojo_shell_context.cc
@@ -6,11 +6,14 @@
 
 #include <utility>
 
+#include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
+#include "components/filesystem/file_system_app.h"
+#include "components/leveldb/leveldb_app.h"
 #include "content/browser/gpu/gpu_process_host.h"
 #include "content/common/gpu/gpu_process_launch_causes.h"
 #include "content/common/mojo/static_application_loader.h"
@@ -249,6 +252,24 @@ MojoShellContext::MojoShellContext() {
       scoped_ptr<mojo::shell::ApplicationLoader>(new GpuProcessLoader()),
       GURL("mojo:media"));
 #endif
+
+  // This starts the filesystem stuff, but it immediately breaks due to
+  // the capability filter preventing filesystem from contacting tracing.
+  base::FilePath path =
+      base::FilePath::FromUTF8Unsafe("/work/chrome/tmp_profile");

[Elliot Glaysher, 2016/02/25 23:16:12]

So my current big question is how do I safely get the path to the current user
data dir from here?

MojoShellContext is initialized during BrowserMainLoop::BrowserThreadsStarted();
I don't believe we yet have a profile. Now I could try to recreate the logic
that we do in chrome, but that's actually really complicated and I was wondering
if there was any shortcut here. chrome's GetDefaultUserDataDirectory() is
actually has platform specific implementations, and also references "chrome"
outright, which I assume we don't want at this layer.

(Really, we should have a ProfileService here which encapsulates access to the
filesystem here, but Ben's user identity changes haven't landed yet, so this is
delayed on that.)

+  base::Callback<scoped_ptr<mojo::ShellClient>()> fs_callback =
+      base::Bind(&filesystem::CreateFileSystemApp, path);
+  application_manager_->SetLoaderForURL(
+       scoped_ptr<mojo::shell::ApplicationLoader>(
+           new StaticApplicationLoader(fs_callback)),
+       GURL("mojo:filesystem"));
+
+  base::Callback<scoped_ptr<mojo::ShellClient>()> leveldb_callback =
+      base::Bind(&leveldb::CreateLevelDBApp);
+  application_manager_->SetLoaderForURL(
+      scoped_ptr<mojo::shell::ApplicationLoader>(
+          new StaticApplicationLoader(leveldb_callback)),
+      GURL("mojo:leveldb"));
 }
 
 MojoShellContext::~MojoShellContext() {