Add support for the ExperimentalSwReporterEngine field trial.

chrome/browser/safe_browsing/srt_fetcher_win.h

Index: chrome/browser/safe_browsing/srt_fetcher_win.h
diff --git a/chrome/browser/safe_browsing/srt_fetcher_win.h b/chrome/browser/safe_browsing/srt_fetcher_win.h
index 7d310194d93001db65c2c1556608c6649b85319a..66ba4cb89eb063ba1586916250ed1782bd6c4478 100644
--- a/chrome/browser/safe_browsing/srt_fetcher_win.h
+++ b/chrome/browser/safe_browsing/srt_fetcher_win.h
@@ -8,13 +8,14 @@
 #include <limits.h>
 
 #include <string>
+#include <vector>
 
 #include "base/callback_forward.h"
+#include "base/command_line.h"
 #include "base/memory/ref_counted.h"
 #include "base/version.h"
 
 namespace base {
-class FilePath;
 class TaskRunner;
 }
 
@@ -43,19 +44,58 @@ const int kDaysBetweenSwReporterRunsForPendingPrompt = 1;
 // To test SRT Fetches.
 const int kSRTFetcherID = 47;
 
+// Parameters used to invoke the sw_reporter component.
+struct SwReporterInvocation {
+  base::CommandLine command_line;
+
+  // Experimental versions of the reporter will write metrics to registry keys
+  // ending in |suffix|. Those metrics should be copid to UMA histograms also
+  // ending in |suffix|. For the canonical version, |suffix| will be empty.
+  std::string suffix;
+
+  SwReporterInvocation();
+  explicit SwReporterInvocation(const base::FilePath& exe_path);
+  SwReporterInvocation(const base::CommandLine& command_line,
+                       const std::string& suffix);
+
+  bool operator==(const SwReporterInvocation& other) const;
+};
+
 // Tries to run the sw_reporter component, and then schedule the next try. If
 // called multiple times, then multiple sequences of trying to run will happen,
 // yet only one reporter will run per specified period (either
 // |kDaysBetweenSuccessfulSwReporterRuns| or
 // |kDaysBetweenSwReporterRunsForPendingPrompt|) will actually happen.
-// |exe_path| is the full path to the SwReporter to execute and |version| is its
-// version. The task runners are provided to allow tests to provide their own.
+// |command_line| is the command line to execute, including the full path to
+// the SwReporter to execute, and |version| is its version. The task runners are
+// provided to allow tests to provide their own.
 void RunSwReporter(
     const base::FilePath& exe_path,
     const base::Version& version,
     const scoped_refptr<base::TaskRunner>& main_thread_task_runner,
     const scoped_refptr<base::TaskRunner>& blocking_task_runner);
 
+// Try to run multiple invocations of the experimental sw_reporter component,
+// with different combinations of command line args. Each set of invocations is
+// treated as a normal scheduled launch of the sw_reporter for the purposes of
+// retries, as described in |RunSwReporter|.
+//
+// |invocation_queue| is a list of sw_reporter configurations which will be
+// launched in order. Once one has been executed, the reporter is considered to
+// have "run" - the remainder will also be executed as part of this run, but
+// then the reporter will not be run again for the specified period. If none of
+// the invocations in the queue execute, another queue can be tried by calling
+// this function again.
+//
+// See |RunSwReporter| for the meaning of the remaining parameters.
+//
+// The experimental sw_reporter never triggers the prompt, just reports results.
+void RunExperimentalSwReporters(
+    const std::vector<SwReporterInvocation>& invocation_queue,
+    const base::Version& version,
+    const scoped_refptr<base::TaskRunner>& main_thread_task_runner,
+    const scoped_refptr<base::TaskRunner>& blocking_task_runner);
+
 // Returns true iff Local State is successfully accessed and indicates the most
 // recent Reporter run terminated with an exit code indicating the presence of
 // UwS.