[Blimp] Adds blimp engine browser test framework and LoadUrl test.

blimp/engine/app/blimp_engine_config.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "blimp/engine/app/blimp_engine_config.h"
 
 #include <memory>
 #include <string>
 
+#include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_util.h"
 #include "blimp/engine/app/switches.h"
+#include "cc/base/switches.h"
+#include "content/public/common/content_switches.h"
+#include "ui/gl/gl_switches.h"
+#include "ui/native_theme/native_theme_switches.h"
 
 namespace blimp {
 namespace engine {
 
 namespace {
 // Gets the client token from the file provided by the command line. If a read
 // does not succeed, or the switch is malformed, an empty string is returned.
 std::string GetClientToken(const base::CommandLine& cmd_line) {
   std::string file_contents;
   const base::FilePath path = cmd_line.GetSwitchValuePath(kClientTokenPath);
   if (!base::ReadFileToString(path, &file_contents)) {
     LOG(ERROR) << "Could not read client token file at "
                << (path.empty() ? "(not provided)" : path.AsUTF8Unsafe());
   }
   return base::CollapseWhitespaceASCII(file_contents, true);
 }
 }  // namespace
 
+void SetCommandLineDefaults(base::CommandLine* command_line) {
+  command_line->AppendSwitch(::switches::kEnableOverlayScrollbar);
+  command_line->AppendSwitch(cc::switches::kDisableCachedPictureRaster);
+  command_line->AppendSwitch(::switches::kDisableGpu);
+  command_line->AppendSwitch(
+      "disable-remote-fonts");  // switches::kDisableRemoteFonts is not visible.
+  command_line->AppendSwitch(::switches::kUseRemoteCompositing);
+  command_line->AppendSwitchASCII(
+      ::switches::kUseGL,
+      "osmesa");  // Avoid invoking gpu::CollectDriverVersionNVidia.
+}
+
 BlimpEngineConfig::~BlimpEngineConfig() {}
 
 // static
 std::unique_ptr<BlimpEngineConfig> BlimpEngineConfig::Create(
     const base::CommandLine& cmd_line) {
   const std::string client_token = GetClientToken(cmd_line);
   if (!client_token.empty()) {
     return base::WrapUnique(new BlimpEngineConfig(client_token));
   }
   return nullptr;
 }
 
 // static
 std::unique_ptr<BlimpEngineConfig> BlimpEngineConfig::CreateForTest(
     const std::string& client_token) {
   return base::WrapUnique(new BlimpEngineConfig(client_token));
 }
 
 const std::string& BlimpEngineConfig::client_token() const {
   return client_token_;
 }
 
 BlimpEngineConfig::BlimpEngineConfig(const std::string& client_token)
     : client_token_(client_token) {}
 
 }  // namespace engine
 }  // namespace blimp