[mojo] Make HTML viewer load the blink resources from the generated pak file.

Blink is about to make use of blink_resources.grd for the inline resources of user agent stylesheets.
This removes the dependency upon using make-file-arrays.py which embeds these resources as strings.
See part 1, 2 and 3.

Also the .rodata section of libblink_web (in component build mode) is reduced by ~33kb.

In this CL, the html viewer would implement the loadResource() method and use the DataPack to
load the required resources. The resources are generated from blink_resources.grd which has been
added as the deps.

Part 1: https://codereview.chromium.org/436843004/
Part 2: https://codereview.chromium.org/422023008
Part 3: https://codereview.chromium.org/573553002

BUG=312586

Review URL: https://codereview.chromium.org/827223002

Cr-Commit-Position: refs/heads/master@{#311420}

6 files changed, 264 insertions, 0 deletions

diff --git a/mojo/services/html_viewer/BUILD.gn b/mojo/services/html_viewer/BUILD.gn
index 444ee07..7537caf 100644
--- a/mojo/services/html_viewer/BUILD.gn
+++ b/mojo/services/html_viewer/BUILD.gn
@@ -5,8 +5,29 @@
 import("//mojo/public/mojo.gni")
 import("//mojo/public/mojo_application.gni")
 
+action("generate_blink_resource_map") {
+  script = "//mojo/services/html_viewer/generate_blink_resource_map.py"
+  args = [
+    "--pak-file",
+    rebase_path("$root_out_dir/gen/blink/public/resources/blink_resources.pak"),
+    "--header",
+    rebase_path("$target_gen_dir/blink_resource_map.h"),
+    "--cpp",
+    rebase_path("$target_gen_dir/blink_resource_map.cc"),
+  ]
+  outputs = [
+    "$target_gen_dir/blink_resource_map.cc",
+    "$target_gen_dir/blink_resource_map.h",
+  ]
+  public_deps = [
+    "//third_party/WebKit/public:resources",
+  ]
+}
+
 source_set("lib") {
   sources = [
+    "$target_gen_dir/blink_resource_map.cc",
+    "$target_gen_dir/blink_resource_map.h",
     "ax_provider_impl.cc",
     "ax_provider_impl.h",
     "blink_basic_type_converters.cc",
@@ -15,6 +36,7 @@ source_set("lib") {
     "blink_input_events_type_converters.h",
     "blink_platform_impl.cc",
     "blink_platform_impl.h",
+    "blink_resource_constants.h",
     "blink_url_request_type_converters.cc",
     "blink_url_request_type_converters.h",
     "html_document.cc",
@@ -81,6 +103,7 @@ source_set("lib") {
   public_deps = [
     "//mojo/public/cpp/bindings",
     "//third_party/WebKit/public:blink",
+    ":generate_blink_resource_map",
   ]
 }
 
diff --git a/mojo/services/html_viewer/DEPS b/mojo/services/html_viewer/DEPS
index 3d4a855..37deb33 100644
--- a/mojo/services/html_viewer/DEPS
+++ b/mojo/services/html_viewer/DEPS
@@ -1,4 +1,5 @@
 include_rules = [
+  "+blink/public/resources",
   "+cc",
   "+gin",
   "+media",
diff --git a/mojo/services/html_viewer/blink_platform_impl.cc b/mojo/services/html_viewer/blink_platform_impl.cc
index d97a509..441ca0c 100644
--- a/mojo/services/html_viewer/blink_platform_impl.cc
+++ b/mojo/services/html_viewer/blink_platform_impl.cc
@@ -11,6 +11,7 @@
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
+#include "mojo/services/html_viewer/blink_resource_constants.h"
 #include "mojo/services/html_viewer/webthread_impl.h"
 #include "net/base/data_url.h"
 #include "net/base/mime_util.h"
@@ -143,6 +144,20 @@ const unsigned char* BlinkPlatformImpl::getTraceCategoryEnabledFlag(
   return buf;
 }
 
+blink::WebData BlinkPlatformImpl::loadResource(const char* resource) {
+  for (size_t i = 0; i < arraysize(kDataResources); ++i) {
+    if (!strcmp(resource, kDataResources[i].name)) {
+      int length;
+      const char* data =
+          blink_resource_map_.GetResource(kDataResources[i].id, &length);
+      CHECK(data != nullptr && length > 0);
+      return blink::WebData(data, length);
+    }
+  }
+  NOTREACHED() << "Requested resource is unavailable!";
+  return blink::WebData();
+}
+
 blink::WebURLLoader* BlinkPlatformImpl::createURLLoader() {
   return NULL;
 }
diff --git a/mojo/services/html_viewer/blink_platform_impl.h b/mojo/services/html_viewer/blink_platform_impl.h
index 10f2c49..7ef8236 100644
--- a/mojo/services/html_viewer/blink_platform_impl.h
+++ b/mojo/services/html_viewer/blink_platform_impl.h
@@ -10,6 +10,7 @@
 #include "base/threading/thread_local_storage.h"
 #include "base/timer/timer.h"
 #include "cc/blink/web_compositor_support_impl.h"
+#include "mojo/services/html_viewer/blink_resource_map.h"
 #include "mojo/services/html_viewer/webmimeregistry_impl.h"
 #include "mojo/services/html_viewer/webthemeengine_impl.h"
 #include "third_party/WebKit/public/platform/Platform.h"
@@ -52,6 +53,7 @@ class BlinkPlatformImpl : public blink::Platform {
   virtual blink::WebScrollbarBehavior* scrollbarBehavior();
   virtual const unsigned char* getTraceCategoryEnabledFlag(
       const char* category_name);
+  virtual blink::WebData loadResource(const char* name);
 
  private:
   void SuspendSharedTimer();
@@ -75,6 +77,7 @@ class BlinkPlatformImpl : public blink::Platform {
   WebThemeEngineImpl theme_engine_;
   WebMimeRegistryImpl mime_registry_;
   blink::WebScrollbarBehavior scrollbar_behavior_;
+  BlinkResourceMap blink_resource_map_;
 
   DISALLOW_COPY_AND_ASSIGN(BlinkPlatformImpl);
 };
diff --git a/mojo/services/html_viewer/blink_resource_constants.h b/mojo/services/html_viewer/blink_resource_constants.h
new file mode 100644
index 0000000..c4ebb90
--- /dev/null
+++ b/mojo/services/html_viewer/blink_resource_constants.h
@@ -0,0 +1,71 @@
+// 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.
+
+#ifndef MOJO_SERVICES_HTML_VIEWER_BLINK_RESOURCE_CONSTANTS_H_
+#define MOJO_SERVICES_HTML_VIEWER_BLINK_RESOURCE_CONSTANTS_H_
+
+#include "blink/public/resources/grit/blink_resources.h"
+
+namespace html_viewer {
+
+struct DataResource {
+  const char* name;
+  int id;
+};
+
+const DataResource kDataResources[] = {
+    {"html.css", IDR_UASTYLE_HTML_CSS},
+    {"quirks.css", IDR_UASTYLE_QUIRKS_CSS},
+    {"view-source.css", IDR_UASTYLE_VIEW_SOURCE_CSS},
+    {"themeChromium.css", IDR_UASTYLE_THEME_CHROMIUM_CSS},
+#if defined(OS_ANDROID)
+    {"themeChromiumAndroid.css", IDR_UASTYLE_THEME_CHROMIUM_ANDROID_CSS},
+    {"mediaControlsAndroid.css", IDR_UASTYLE_MEDIA_CONTROLS_ANDROID_CSS},
+#endif
+#if defined(OS_LINUX)
+    {"themeChromiumLinux.css", IDR_UASTYLE_THEME_CHROMIUM_LINUX_CSS},
+#endif
+    {"themeChromiumSkia.css", IDR_UASTYLE_THEME_CHROMIUM_SKIA_CSS},
+    {"themeInputMultipleFields.css",
+     IDR_UASTYLE_THEME_INPUT_MULTIPLE_FIELDS_CSS},
+#if defined(OS_MACOSX)
+    {"themeMac.css", IDR_UASTYLE_THEME_MAC_CSS},
+#endif
+    {"themeWin.css", IDR_UASTYLE_THEME_WIN_CSS},
+    {"themeWinQuirks.css", IDR_UASTYLE_THEME_WIN_QUIRKS_CSS},
+    {"svg.css", IDR_UASTYLE_SVG_CSS},
+    {"navigationTransitions.css", IDR_UASTYLE_NAVIGATION_TRANSITIONS_CSS},
+    {"mathml.css", IDR_UASTYLE_MATHML_CSS},
+    {"mediaControls.css", IDR_UASTYLE_MEDIA_CONTROLS_CSS},
+    {"fullscreen.css", IDR_UASTYLE_FULLSCREEN_CSS},
+    {"xhtmlmp.css", IDR_UASTYLE_XHTMLMP_CSS},
+    {"viewportAndroid.css", IDR_UASTYLE_VIEWPORT_ANDROID_CSS},
+    {"InspectorOverlayPage.html", IDR_INSPECTOR_OVERLAY_PAGE_HTML},
+    {"InjectedScriptCanvasModuleSource.js",
+     IDR_INSPECTOR_INJECTED_SCRIPT_CANVAS_MODULE_SOURCE_JS},
+    {"InjectedScriptSource.js", IDR_INSPECTOR_INJECTED_SCRIPT_SOURCE_JS},
+    {"DebuggerScriptSource.js", IDR_INSPECTOR_DEBUGGER_SCRIPT_SOURCE_JS},
+    {"DocumentExecCommand.js", IDR_PRIVATE_SCRIPT_DOCUMENTEXECCOMMAND_JS},
+    {"DocumentXMLTreeViewer.css", IDR_PRIVATE_SCRIPT_DOCUMENTXMLTREEVIEWER_CSS},
+    {"DocumentXMLTreeViewer.js", IDR_PRIVATE_SCRIPT_DOCUMENTXMLTREEVIEWER_JS},
+    {"HTMLMarqueeElement.js", IDR_PRIVATE_SCRIPT_HTMLMARQUEEELEMENT_JS},
+    {"PluginPlaceholderElement.js",
+     IDR_PRIVATE_SCRIPT_PLUGINPLACEHOLDERELEMENT_JS},
+    {"PrivateScriptRunner.js", IDR_PRIVATE_SCRIPT_PRIVATESCRIPTRUNNER_JS},
+#ifdef IDR_PICKER_COMMON_JS
+    {"pickerCommon.js", IDR_PICKER_COMMON_JS},
+    {"pickerCommon.css", IDR_PICKER_COMMON_CSS},
+    {"calendarPicker.js", IDR_CALENDAR_PICKER_JS},
+    {"calendarPicker.css", IDR_CALENDAR_PICKER_CSS},
+    {"pickerButton.css", IDR_PICKER_BUTTON_CSS},
+    {"suggestionPicker.js", IDR_SUGGESTION_PICKER_JS},
+    {"suggestionPicker.css", IDR_SUGGESTION_PICKER_CSS},
+    {"colorSuggestionPicker.js", IDR_COLOR_SUGGESTION_PICKER_JS},
+    {"colorSuggestionPicker.css", IDR_COLOR_SUGGESTION_PICKER_CSS}
+#endif
+};
+
+} // namespace html_viewer
+
+#endif // MOJO_SERVICES_HTML_VIEWER_BLINK_RESOURCE_CONSTANTS_H_
diff --git a/mojo/services/html_viewer/generate_blink_resource_map.py b/mojo/services/html_viewer/generate_blink_resource_map.py
new file mode 100644
index 0000000..4044154
--- /dev/null
+++ b/mojo/services/html_viewer/generate_blink_resource_map.py
@@ -0,0 +1,151 @@
+# 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.
+
+from string import Template
+
+import optparse
+import os
+import sys
+
+try:
+  grit_module_path = os.path.join(
+      os.path.dirname(__file__),  '..', '..', '..', 'tools', 'grit')
+  sys.path.insert(0, grit_module_path)
+  from grit.format import data_pack as DataPack
+except ImportError, e:
+  print 'ImportError: ', e
+  sys.exit(-1)
+
+def is_ascii(s):
+  return all(ord(c) < 128 for c in s)
+
+header_template = \
+"""// 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.
+
+#ifndef MOJO_SERVICES_HTML_VIEWER_BLINK_RESOURCE_MAP_H_
+#define MOJO_SERVICES_HTML_VIEWER_BLINK_RESOURCE_MAP_H_
+
+#include <map>
+
+namespace html_viewer {
+
+class BlinkResourceMap {
+ public:
+  BlinkResourceMap();
+  const char* GetResource(int id, int* length);
+
+ private:
+  struct ResourceEntry {
+    const char* data;
+    int length;
+
+    ResourceEntry()
+      : data(nullptr)
+      , length(0) {
+    }
+
+    ResourceEntry(const char* data, int length)
+      : data(data)
+      , length(length) {
+    }
+  };
+  typedef std::map<int, ResourceEntry> ResourceMap;
+  ResourceMap resources_;
+};
+
+} // namespace html_viewer
+#endif // MOJO_SERVICES_HTML_VIEWER_BLINK_RESOURCE_MAP_H_"""
+
+cpp_template = \
+"""// 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 "$header_file_name"
+
+#include "base/macros.h"
+
+namespace html_viewer {
+
+$definitions
+
+BlinkResourceMap::BlinkResourceMap()
+{
+  $map_initializer
+}
+
+const char* BlinkResourceMap::GetResource(int id, int* length)
+{
+  ResourceMap::iterator it = resources_.find(id);
+  if (it == resources_.end()) {
+    *length = 0;
+    return nullptr;
+  }
+  *length = it->second.length;
+  return it->second.data;
+}
+
+} // namespace html_viewer"""
+
+def main():
+  parser = optparse.OptionParser(
+    usage='Usage: %prog --pak-file PAK_FILE --header HEADER --cpp CPP\n')
+  parser.add_option('-i', '--pak-file', action='store', dest='pak_file',
+                    help='The .pak file to be extracted.')
+  parser.add_option('', '--header', action='store', dest='header_file',
+                    help='Header file to be generated.')
+  parser.add_option('', '--cpp', action='store', dest='cpp_file',
+                    help='C++ file to be generated.')
+
+  (options, _) = parser.parse_args()
+  if (not options.pak_file or not options.header_file or not options.cpp_file):
+    parser.print_help()
+    sys.exit(-1)
+
+  header_file = open(options.header_file, 'w+')
+  cpp_file = open(options.cpp_file, 'w+')
+
+  pak_contents = DataPack.ReadDataPack(options.pak_file)
+  resourceIds = []
+
+  header_contents = dict()
+  cpp_contents = dict()
+
+  definitions = []
+
+  for (resId, data) in pak_contents.resources.iteritems():
+    if not is_ascii(data):
+      continue
+    resourceIds.append(resId)
+    hex_values = ['0x{0:02x}'.format(ord(char)) for char in data]
+    f = lambda A, n=12: [A[i:i+n] for i in range(0, len(A), n)]
+    hex_values_string = ',\n    '.join(', '.join(x) for x in f(hex_values))
+    cpp_definition = \
+        'const char kResource%s[%d] = {\n    %s \n};' % \
+        (str(resId), len(hex_values), hex_values_string)
+    definitions.append(cpp_definition)
+
+  header_file_contents = Template(header_template).substitute(header_contents)
+  header_file.write(header_file_contents)
+  header_file.close()
+
+  map_initializer = []
+  for resId in resourceIds:
+    insert_statement = \
+        'resources_.insert(std::pair<int, ResourceEntry>(\n' \
+        '      %s, ResourceEntry(kResource%s, arraysize(kResource%s))));'
+    map_initializer.append( \
+        insert_statement % (str(resId), str(resId), str(resId)))
+
+  cpp_contents['definitions']= '\n'.join(definitions)
+  cpp_contents['header_file_name'] = os.path.basename(options.header_file)
+  cpp_contents['map_initializer'] = '\n  '.join(map_initializer)
+  cpp_file_contents = Template(cpp_template).substitute(cpp_contents)
+  cpp_file.write(cpp_file_contents)
+  cpp_file.close()
+
+if __name__ == '__main__':
+  main()