Allow create webview in new process.

Attribute 'usenewprocess' added on webview. If used it ensure that webview is started in new process. If not used chrome will decide whether or not new process will be used.

extensions/browser/guest_view/web_view/web_view_constants.cc

@@ -11,6 +11,7 @@ const char kAttributeAllowTransparency[] = "allowtransparency";
 const char kAttributeAllowScaling[] = "allowscaling";
 const char kAttributeName[] = "name";
 const char kAttributeSrc[] = "src";
+const char kAttributeUseNewProcess[] = "usenewprocess";
 
 // API namespace.
 const char kAPINamespace[] = "webViewInternal";

extensions/browser/guest_view/web_view/web_view_constants.h

@@ -16,6 +16,7 @@ extern const char kAttributeAllowTransparency[];
 extern const char kAttributeAllowScaling[];
 extern const char kAttributeName[];
 extern const char kAttributeSrc[];
+extern const char kAttributeUseNewProcess[];
 
 // API namespace.
 // TODO(kalman): Consolidate this with the other API constants.

extensions/browser/guest_view/web_view/web_view_guest.cc

@@ -339,13 +339,17 @@ void WebViewGuest::CreateWebContents(
                                      persist_storage ? "persist" : "",
                                      url_encoded_partition.c_str()));
 
-  // If we already have a webview tag in the same app using the same storage
-  // partition, we should use the same SiteInstance so the existing tag and
-  // the new tag can script each other.
-  auto guest_view_manager = GuestViewManager::FromBrowserContext(
+  bool useNewProcess = false;
+  create_params.GetBoolean(webview::kAttributeUseNewProcess, &useNewProcess);
+  content::SiteInstance* guest_site_instance = nullptr;
+  if (!useNewProcess) {
+    // If we already have a webview tag in the same app using the same storage
+    // partition, we should use the same SiteInstance so the existing tag and
+    // the new tag can script each other.
+    auto guest_view_manager = GuestViewManager::FromBrowserContext(
       owner_render_process_host->GetBrowserContext());
-  content::SiteInstance* guest_site_instance =
-      guest_view_manager->GetGuestSiteInstance(guest_site);
+    guest_site_instance = guest_view_manager->GetGuestSiteInstance(guest_site);
+  }
   if (!guest_site_instance) {
     // Create the SiteInstance in a new BrowsingInstance, which will ensure
     // that webview tags are also not allowed to send messages across

extensions/renderer/resources/guest_view/web_view/web_view_attributes.js

@@ -249,6 +249,21 @@ SrcAttribute.prototype.parse = function() {
   WebViewInternal.navigate(this.view.guest.getId(), this.getValue());
 };
 
+// -----------------------------------------------------------------------------
+// UseNewProcessAttribute object.
+
+// Attribute that specifies whether new process should be used.
+function UseNewProcessAttribute(view) {
+  GuestViewAttributes.BooleanAttribute.call(
+      this, WebViewConstants.ATTRIBUTE_USENEWPROCESS, view);
+}
+
+UseNewProcessAttribute.prototype.__proto__ =
+    GuestViewAttributes.BooleanAttribute.prototype;
+
+UseNewProcessAttribute.prototype.handleMutation =
+    UseNewProcessAttribute.prototype.handleMutation;
+
 // -----------------------------------------------------------------------------
 
 // Sets up all of the webview attributes.
@@ -265,6 +280,8 @@ WebViewImpl.prototype.setupAttributes = function() {
       new PartitionAttribute(this);
   this.attributes[WebViewConstants.ATTRIBUTE_SRC] =
       new SrcAttribute(this);
+this.attributes[WebViewConstants.ATTRIBUTE_USENEWPROCESS] =
+      new UseNewProcessAttribute(this);
 
   var autosizeAttributes = [WebViewConstants.ATTRIBUTE_MAXHEIGHT,
                             WebViewConstants.ATTRIBUTE_MAXWIDTH,

extensions/renderer/resources/guest_view/web_view/web_view_constants.js

@@ -16,6 +16,7 @@ var WebViewConstants = {
   ATTRIBUTE_MINWIDTH: 'minwidth',
   ATTRIBUTE_NAME: 'name',
   ATTRIBUTE_PARTITION: 'partition',
+  ATTRIBUTE_USENEWPROCESS: 'usenewprocess',
   ATTRIBUTE_SRC: 'src',
 
   // Error/warning messages.