Convert Web Store Inline Install IPCs to mojo

chrome/common/extensions/mojo/inline_install_status.mojom

Index: chrome/common/extensions/mojo/inline_install_status.mojom
diff --git a/chrome/common/extensions/mojo/inline_install_status.mojom b/chrome/common/extensions/mojo/inline_install_status.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..f8828677ff65e85605824faa44a15d2f30c41f00
--- /dev/null
+++ b/chrome/common/extensions/mojo/inline_install_status.mojom
@@ -0,0 +1,27 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module extensions.mojom;
+
+[Native]
+enum WebstoreInstallStage;
+
+[Native]
+enum WebstoreInstallResult;
+
+interface InlineInstallStatus {

[Devlin, 2017/03/31 14:18:39]

Any reason to not combine this with the other mojom?

[catmullings, 2017/04/06 20:50:15]

Done.

+  // Notifies the renderer once the installation mentioned on
+  // InlineWebstoreInstall is complete.
+  InlineWebstoreInstallResponse(int32 install_id, bool success, string error,

[Devlin, 2017/03/31 14:18:39]

One of the advantages of mojo is that it can provide a callback for methods that
used to need to do a call -> response pattern.  That way, you can pass the
callback directly in and just run it when the task completes.

So for this, we could do something like:
DoInlineInstall(...) => (int32 install_id, bool success, string error,
WebStoreInstallResult result)
and omit the InlineWebstoreInstallResponse message.

[catmullings, 2017/04/06 20:50:15]

Done.

+      WebstoreInstallResult result);
+
+  // Notifies the renderer when install stage updates were requested for an
+  // inline install.
+  InlineInstallStageChanged(WebstoreInstallStage stage);
+
+  // Notifies the renderer when download progress updates were requested for an
+  // inline install.
+  InlineInstallDownloadProgress(int32 percent_downloaded);
+};
+