Adds file handling to WebApps.

Enables file handling in non-extension based web apps.

Bug: 938103
Change-Id: I2610e5712c556f03104c95d27a06cfd137b801db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824525Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699633}

chrome/browser/ui/web_applications/web_app_file_handling_browsertest.cc

@@ -115,4 +115,5 @@ INSTANTIATE_TEST_SUITE_P(
     WebAppFileHandlingBrowserTest,
     ::testing::Values(
         web_app::ControllerType::kHostedAppController,
-        web_app::ControllerType::kUnifiedControllerWithBookmarkApp));
+        web_app::ControllerType::kUnifiedControllerWithBookmarkApp,
+        web_app::ControllerType::kUnifiedControllerWithWebApp));

chrome/browser/ui/web_applications/web_app_launch_manager.cc

@@ -13,7 +13,9 @@
 #include "chrome/browser/web_applications/web_app.h"
 #include "chrome/browser/web_applications/web_app_provider.h"
 #include "chrome/browser/web_applications/web_app_registrar.h"
+#include "chrome/browser/web_launch/web_launch_files_helper.h"
 #include "content/public/browser/render_view_host.h"
+#include "third_party/blink/public/common/features.h"
 #include "third_party/blink/public/mojom/renderer_preferences.mojom.h"
 
 namespace web_app {
@@ -70,6 +72,12 @@ content::WebContents* ShowWebApplicationWindow(
 
   browser->window()->Show();
   web_contents->SetInitialFocus();
+
+  if (base::FeatureList::IsEnabled(blink::features::kFileHandlingAPI)) {
+    web_launch::WebLaunchFilesHelper::SetLaunchPaths(web_contents, launch_url,
+                                                     params.launch_files);
+  }
+
   return web_contents;
 }