Teach mojo_js_bindings_unittests to load generated JS files

This CL generalizes gin::FileModuleProvider to be able to load modules from
several places in the file system. I've then made use of this facility in
mojo_js_bindings_unittests to load generated JavaScript modules created by
mojom_js_generator.py, similar to how C++ files can #include from the generated
mojom directory.

I've deleted sample_service.js now that we can load it from the generated
directory.

BUG=317398

Review URL: https://codereview.chromium.org/81673002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236711 0039d316-1c4b-4281-b951-d872f2087c98

4 files changed, 28 insertions, 19 deletions

diff --git a/gin/modules/file_module_provider.cc b/gin/modules/file_module_provider.cc
index 0a3e24c..990dcd0 100644
--- a/gin/modules/file_module_provider.cc
+++ b/gin/modules/file_module_provider.cc
@@ -15,14 +15,15 @@ namespace gin {
 namespace {
 
 void AttempToLoadModule(const base::WeakPtr<Runner>& runner,
-                        const base::FilePath& base,
+                        const std::vector<base::FilePath>& search_paths,
                         const std::string& id) {
   if (!runner)
     return;
 
   std::vector<std::string> components;
   base::SplitString(id, '/', &components);
-  base::FilePath path = base;
+
+  base::FilePath path;
   for (size_t i = 0; i < components.size(); ++i) {
     // TODO(abarth): Technically the path components can be UTF-8. We don't
     // handle that case correctly yet.
@@ -30,21 +31,25 @@ void AttempToLoadModule(const base::WeakPtr<Runner>& runner,
   }
   path = path.AddExtension(FILE_PATH_LITERAL("js"));
 
-  std::string source;
-  if (!ReadFileToString(path, &source))
-    return;
+  for (size_t i = 0; i < search_paths.size(); ++i) {
+    std::string source;
+    if (!ReadFileToString(search_paths[i].Append(path), &source))
+      continue;
 
-  Runner::Scope scope(runner.get());
-  v8::Handle<v8::Script> script = v8::Script::New(
-      StringToV8(runner->isolate(), source),
-      StringToV8(runner->isolate(), id));
-  runner->Run(script);
+    Runner::Scope scope(runner.get());
+    v8::Handle<v8::Script> script = v8::Script::New(
+        StringToV8(runner->isolate(), source),
+        StringToV8(runner->isolate(), id));
+    runner->Run(script);
+    return;
+  }
 }
 
 }  // namespace
 
-FileModuleProvider::FileModuleProvider(const base::FilePath& base)
-    : base_(base) {
+FileModuleProvider::FileModuleProvider(
+    const std::vector<base::FilePath>& search_paths)
+    : search_paths_(search_paths) {
 }
 
 FileModuleProvider::~FileModuleProvider() {
@@ -59,8 +64,8 @@ void FileModuleProvider::AttempToLoadModules(
     if (attempted_ids_.count(id))
       continue;
     attempted_ids_.insert(id);
-    base::MessageLoop::current()->PostTask(FROM_HERE,
-        base::Bind(AttempToLoadModule, runner->GetWeakPtr(), base_, id));
+    base::MessageLoop::current()->PostTask(FROM_HERE, base::Bind(
+        AttempToLoadModule, runner->GetWeakPtr(), search_paths_, id));
   }
 }
 
diff --git a/gin/modules/file_module_provider.h b/gin/modules/file_module_provider.h
index 1e6fb88e..e82d8e3 100644
--- a/gin/modules/file_module_provider.h
+++ b/gin/modules/file_module_provider.h
@@ -7,6 +7,7 @@
 
 #include <set>
 #include <string>
+#include <vector>
 
 #include "base/files/file_path.h"
 #include "gin/runner.h"
@@ -15,13 +16,14 @@ namespace gin {
 
 class FileModuleProvider {
  public:
-  explicit FileModuleProvider(const base::FilePath& base);
+  explicit FileModuleProvider(
+      const std::vector<base::FilePath>& search_paths);
   ~FileModuleProvider();
 
   void AttempToLoadModules(Runner* runner, const std::set<std::string>& ids);
 
  private:
-  base::FilePath base_;
+  std::vector<base::FilePath> search_paths_;
   std::set<std::string> attempted_ids_;
 
   DISALLOW_COPY_AND_ASSIGN(FileModuleProvider);
diff --git a/gin/modules/module_runner_delegate.cc b/gin/modules/module_runner_delegate.cc
index 50b9f5e..3f2422c 100644
--- a/gin/modules/module_runner_delegate.cc
+++ b/gin/modules/module_runner_delegate.cc
@@ -8,8 +8,9 @@
 
 namespace gin {
 
-ModuleRunnerDelegate::ModuleRunnerDelegate(const base::FilePath& module_base)
-    : module_provider_(module_base) {
+ModuleRunnerDelegate::ModuleRunnerDelegate(
+  const std::vector<base::FilePath>& search_paths)
+    : module_provider_(search_paths) {
 }
 
 ModuleRunnerDelegate::~ModuleRunnerDelegate() {
diff --git a/gin/modules/module_runner_delegate.h b/gin/modules/module_runner_delegate.h
index 4d821d2..a66695f 100644
--- a/gin/modules/module_runner_delegate.h
+++ b/gin/modules/module_runner_delegate.h
@@ -18,7 +18,8 @@ typedef v8::Local<v8::ObjectTemplate> (*ModuleTemplateGetter)(
 
 class ModuleRunnerDelegate : public RunnerDelegate {
  public:
-  explicit ModuleRunnerDelegate(const base::FilePath& module_base);
+  explicit ModuleRunnerDelegate(
+      const std::vector<base::FilePath>& search_paths);
   virtual ~ModuleRunnerDelegate();
 
   void AddBuiltinModule(const std::string& id, ModuleTemplateGetter templ);