Added GetCoalescedPermissionMessages to PermissionMessageProvider

Added a GetCoalescedPermissionMessages() method to
PermissionMessageProvider and all its subclasses, including
ChromePermissionMessageProvider. Also implemented the first set of rules
to achieve parity with the existing apps/extensions permission messages
system.

Also updated PermissionsData to have a GetCoalescedPermissionMessages()
function which returns the coalesced permission messages for an app
or extension, and updated the unit tests to check the test output for
both the legacy and new systems.

No callsites that display permission messages have been updated to use
the new system.

BUG=398257

Review URL: https://codereview.chromium.org/798463003

Cr-Commit-Position: refs/heads/master@{#317533}

1 files changed, 11 insertions, 0 deletions

diff --git a/extensions/shell/common/shell_extensions_client.cc b/extensions/shell/common/shell_extensions_client.cc
index 611ff99..53476c4 100644
--- a/extensions/shell/common/shell_extensions_client.cc
+++ b/extensions/shell/common/shell_extensions_client.cc
@@ -48,6 +48,11 @@ class ShellPermissionMessageProvider : public PermissionMessageProvider {
     return PermissionMessages();
   }
 
+  CoalescedPermissionMessages GetCoalescedPermissionMessages(
+      const PermissionIDSet& permissions) const override {
+    return CoalescedPermissionMessages();
+  }
+
   std::vector<base::string16> GetWarningMessages(
       const PermissionSet* permissions,
       Manifest::Type extension_type) const override {
@@ -68,6 +73,12 @@ class ShellPermissionMessageProvider : public PermissionMessageProvider {
     return false;
   }
 
+  PermissionIDSet GetAllPermissionIDs(
+      const PermissionSet* permissions,
+      Manifest::Type extension_type) const override {
+    return PermissionIDSet();
+  }
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ShellPermissionMessageProvider);
 };