Re-use PluginVmInstaller::InstallingState in PluginVmInstallerView

This CL makes PluginVmInstallerView re-use from PluginVmInstaller the
enum indicating installer progress. This somewhat reduces the code that
needs to be written when adding new steps in the installation flow,
but more importantly allows a subsequent CL, crrev.com/c/2214586, to
simplify the installer's observer interface so the UI will only need
to be concerned with what to display to the user for a given state.

Bug: 1063748
Change-Id: I5ce64bb7d641f221af822d4737e35fb21de8d589
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2213651Reviewed-by: Julian Watson <juwa@google.com>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772119}

chrome/browser/ui/views/plugin_vm/plugin_vm_installer_view.h

@@ -55,21 +55,16 @@ class PluginVmInstallerView : public views::BubbleDialogDelegateView,
       base::OnceCallback<void(bool success)> callback);
 
  private:
-  // TODO(crbug.com/1063748): Re-use PluginVmInstaller::InstallingState.
   enum class State {
-    CONFIRM_INSTALL,      // Waiting for user to start installation.
-    CHECKING_LICENSE,     // Ensuring the user license is valid.
-    CHECKING_DISK_SPACE,  // Checking there is available free disk space.
-    LOW_DISK_SPACE,   // Prompt user to continue or abort due to low disk space.
-    DOWNLOADING_DLC,  // PluginVm DLC downloading and installing in progress.
-    CHECKING_VMS,     // Checking for existing VMs.
-    DOWNLOADING,      // Image download (ISO or VM) is in progress.
-    IMPORTING,        // Downloaded image is being imported.
-    CREATED,          // A brand new VM has been created using ISO image.
-    IMPORTED,         // Downloaded VM image has been imported successfully.
-    ERROR,            // Something unexpected happened.
+    kConfirmInstall,  // Waiting for user to start installation.
+    kInstalling,      // Installation in progress.
+    kCreated,         // A brand new VM has been created using ISO image.
+    kImported,        // Downloaded VM image has been imported successfully.
+    kError,           // Something unexpected happened.
   };
 
+  using InstallingState = plugin_vm::PluginVmInstaller::InstallingState;
+
   ~PluginVmInstallerView() override;
 
   int GetCurrentDialogButtons() const;
@@ -97,7 +92,8 @@ class PluginVmInstallerView : public views::BubbleDialogDelegateView,
   views::ImageView* big_image_ = nullptr;
   base::TimeTicks setup_start_tick_;
 
-  State state_ = State::CONFIRM_INSTALL;
+  State state_ = State::kConfirmInstall;
+  InstallingState installing_state_ = InstallingState::kInactive;
   base::Optional<plugin_vm::PluginVmInstaller::FailureReason> reason_;
 
   base::OnceCallback<void(bool success)> finished_callback_for_testing_;