Add support for the ExperimentalSwReporterEngine field trial.

chrome/browser/component_updater/sw_reporter_installer_win.h

Index: chrome/browser/component_updater/sw_reporter_installer_win.h
diff --git a/chrome/browser/component_updater/sw_reporter_installer_win.h b/chrome/browser/component_updater/sw_reporter_installer_win.h
index 7427e5a994258c2ae34bdd31839ced2898ceac66..d5be44907f366e191f8a68c91a2233c9bb8f3e51 100644
--- a/chrome/browser/component_updater/sw_reporter_installer_win.h
+++ b/chrome/browser/component_updater/sw_reporter_installer_win.h
@@ -35,6 +35,14 @@ namespace component_updater {
 
 class ComponentUpdateService;
 
+// These MUST match the values for SwReporterExperimentError in histograms.xml.
+// Exposed for testing.
+enum SwReporterExperimentError {
+  SW_REPORTER_EXPERIMENT_ERROR_BAD_TAG = 0,
+  SW_REPORTER_EXPERIMENT_ERROR_BAD_PARAMS = 1,
+  SW_REPORTER_EXPERIMENT_ERROR_MAX,
+};
+
 // Callback for running the software reporter after it is downloaded.
 using SwReporterRunner =
     base::Callback<void(const safe_browsing::SwReporterInvocation& invocation,
@@ -42,12 +50,10 @@ using SwReporterRunner =
 
 class SwReporterInstallerTraits : public ComponentInstallerTraits {
  public:
-  explicit SwReporterInstallerTraits(const SwReporterRunner& reporter_runner);
+  SwReporterInstallerTraits(const SwReporterRunner& reporter_runner,
+                            bool is_experimental_engine_supported);
   ~SwReporterInstallerTraits() override;
 
- private:
-  friend class SwReporterInstallerTest;
-
   // ComponentInstallerTraits implementation.
   bool VerifyInstallation(const base::DictionaryValue& manifest,
                           const base::FilePath& dir) const override;
@@ -64,7 +70,15 @@ class SwReporterInstallerTraits : public ComponentInstallerTraits {
   update_client::InstallerAttributes GetInstallerAttributes() const override;
   std::vector<std::string> GetMimeTypes() const override;
 
+ private:
+  friend class SwReporterInstallerTest;
+
+  // Returns true if the experimental engine is supported and the Feature is
+  // enabled.
+  bool IsExperimentalEngineEnabled() const;
+
   SwReporterRunner reporter_runner_;
+  const bool is_experimental_engine_supported_;
 
   DISALLOW_COPY_AND_ASSIGN(SwReporterInstallerTraits);
 };