Extensions: Prepare switch to new permission message system

PermissionMessageProvider:
- add GetPermissionMessageStrings which calls either the old or the new system, based on a field trial
- rename GetWarningMessages/GetWarningMessagesDetails to *Legacy*
- replace GetPermissionMessages by GetLegacyPermissionMessageIDs -> remove the old PermissionMessages type from the interface

Callers have *not* been updated to use the new GetPermissionMessageStrings yet.

TBRing trivial change in ephemeral_app_launcher.cc
TBR=asargent@chromium.org

BUG=398257

Review URL: https://codereview.chromium.org/1006453002

Cr-Commit-Position: refs/heads/master@{#320702}

1 files changed, 10 insertions, 4 deletions

diff --git a/extensions/shell/common/shell_extensions_client.cc b/extensions/shell/common/shell_extensions_client.cc
index 53476c4..072ebb1 100644
--- a/extensions/shell/common/shell_extensions_client.cc
+++ b/extensions/shell/common/shell_extensions_client.cc
@@ -42,10 +42,16 @@ class ShellPermissionMessageProvider : public PermissionMessageProvider {
   ~ShellPermissionMessageProvider() override {}
 
   // PermissionMessageProvider implementation.
-  PermissionMessages GetPermissionMessages(
+  PermissionMessageStrings GetPermissionMessageStrings(
       const PermissionSet* permissions,
       Manifest::Type extension_type) const override {
-    return PermissionMessages();
+    return PermissionMessageStrings();
+  }
+
+  PermissionMessageIDs GetLegacyPermissionMessageIDs(
+      const PermissionSet* permissions,
+      Manifest::Type extension_type) const override {
+    return PermissionMessageIDs();
   }
 
   CoalescedPermissionMessages GetCoalescedPermissionMessages(
@@ -53,13 +59,13 @@ class ShellPermissionMessageProvider : public PermissionMessageProvider {
     return CoalescedPermissionMessages();
   }
 
-  std::vector<base::string16> GetWarningMessages(
+  std::vector<base::string16> GetLegacyWarningMessages(
       const PermissionSet* permissions,
       Manifest::Type extension_type) const override {
     return std::vector<base::string16>();
   }
 
-  std::vector<base::string16> GetWarningMessagesDetails(
+  std::vector<base::string16> GetLegacyWarningMessagesDetails(
       const PermissionSet* permissions,
       Manifest::Type extension_type) const override {
     return std::vector<base::string16>();