Convert utility process extension Unpacker IPC to mojo

content/public/browser/utility_process_mojo_client.h

Index: content/public/browser/utility_process_mojo_client.h
diff --git a/content/public/browser/utility_process_mojo_client.h b/content/public/browser/utility_process_mojo_client.h
index cfcb93b953dd1b87f3c8dc4dba6722809db9ac8b..258c3dc2430ff374e93573dbdcae95d43a859a9b 100644
--- a/content/public/browser/utility_process_mojo_client.h
+++ b/content/public/browser/utility_process_mojo_client.h
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "base/callback.h"
+#include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
@@ -42,6 +43,12 @@ class UtilityProcessMojoClient {
     on_error_callback_ = on_error_callback;
   }
 
+  // Allows a directory to be opened through the sandbox.
+  void set_exposed_directory(const base::FilePath& directory) {
+    DCHECK(!start_called_);
+    helper_->set_exposed_directory(directory);
+  }
+
   // Disables the sandbox in the utility process.
   void set_disable_sandbox() {
     DCHECK(!start_called_);
@@ -102,6 +109,10 @@ class UtilityProcessMojoClient {
                      mojo_interface_name, base::Passed(&interface_pipe)));
     }
 
+    void set_exposed_directory(const base::FilePath& directory) {
+      exposed_directory_ = directory;
+    }
+
     void set_disable_sandbox() { disable_sandbox_ = true; }
 
 #if defined(OS_WIN)
@@ -120,6 +131,9 @@ class UtilityProcessMojoClient {
       utility_host_ = UtilityProcessHost::Create(nullptr, nullptr)->AsWeakPtr();
       utility_host_->SetName(process_name_);
 
+      if (!exposed_directory_.empty())
+        utility_host_->SetExposedDir(exposed_directory_);
+
       if (disable_sandbox_)
         utility_host_->DisableSandbox();
 #if defined(OS_WIN)
@@ -137,6 +151,7 @@ class UtilityProcessMojoClient {
 
     // Properties of the utility process.
     base::string16 process_name_;
+    base::FilePath exposed_directory_;
     bool disable_sandbox_ = false;
 #if defined(OS_WIN)
     bool run_elevated_ = false;