alternate ntp: implement searchbox api for instant overlay to adopt themes

chrome/renderer/searchbox/searchbox_extension.cc

Index: chrome/renderer/searchbox/searchbox_extension.cc
diff --git a/chrome/renderer/searchbox/searchbox_extension.cc b/chrome/renderer/searchbox/searchbox_extension.cc
index 54e5e911b75450e21b162d1bd4c96edff2df8d7f..dfffd57aebe0d3488b83f4156ffa730eec2b52bf 100644
--- a/chrome/renderer/searchbox/searchbox_extension.cc
+++ b/chrome/renderer/searchbox/searchbox_extension.cc
@@ -136,6 +136,25 @@ static const char kDispatchContextChangeEventScript[] =
     "  true;"
     "}";
 
+static const char kDispatchThemeChangeEventScript[] =
+    "if (window.chrome &&"
+    "    window.chrome.searchBox &&"
+    "    window.chrome.searchBox.onthemechange &&"
+    "    typeof window.chrome.searchBox.onthemechange == 'function') {"
+    "  window.chrome.searchBox.onthemechange();"
+    "  true;"
+    "}";
+
+static const char kDispatchThemeAreaHeightChangeEventScript[] =
+    "if (window.chrome &&"
+    "    window.chrome.searchBox &&"
+    "    window.chrome.searchBox.onthemeareaheightchange &&"
+    "    typeof window.chrome.searchBox.onthemeareaheightchange =="
+    "        'function') {"
+    "  window.chrome.searchBox.onthemeareaheightchange();"
+    "  true;"
+    "}";
+
 // ----------------------------------------------------------------------------
 
 class SearchBoxExtensionWrapper : public v8::Extension {
@@ -188,6 +207,18 @@ class SearchBoxExtensionWrapper : public v8::Extension {
   // Gets the current session context.
   static v8::Handle<v8::Value> GetContext(const v8::Arguments& args);
 
+  // Gets the background info of the theme currently adopted by browser.
+  // Call only when overlay is showing NTP page.
+  static v8::Handle<v8::Value> GetThemeBackgroundInfo(
+      const v8::Arguments& args);
+
+  // Gets the theme area height that the entire theme background image should
+  // fill up.
+  // Call only when overlay is showing NTP page and GetThemeBackgroundInfo
+  // returns a non-empty image_url and an image_vertical_alignment that is not
+  // "top".
+  static v8::Handle<v8::Value> GetThemeAreaHeight(const v8::Arguments& args);
+
   // Navigates the window to a URL represented by either a URL string or a
   // restricted ID.
   static v8::Handle<v8::Value> NavigateContentWindow(const v8::Arguments& args);
@@ -245,6 +276,10 @@ v8::Handle<v8::FunctionTemplate> SearchBoxExtensionWrapper::GetNativeFunction(
     return v8::FunctionTemplate::New(GetIsFocused);
   if (name->Equals(v8::String::New("GetContext")))
     return v8::FunctionTemplate::New(GetContext);
+  if (name->Equals(v8::String::New("GetThemeBackgroundInfo")))
+    return v8::FunctionTemplate::New(GetThemeBackgroundInfo);
+  if (name->Equals(v8::String::New("GetThemeAreaHeight")))
+    return v8::FunctionTemplate::New(GetThemeAreaHeight);
   if (name->Equals(v8::String::New("NavigateContentWindow")))
     return v8::FunctionTemplate::New(NavigateContentWindow);
   if (name->Equals(v8::String::New("SetSuggestions")))
@@ -399,6 +434,38 @@ v8::Handle<v8::Value> SearchBoxExtensionWrapper::GetContext(
   return context;
 }
 
+v8::Handle<v8::Value> SearchBoxExtensionWrapper::GetThemeBackgroundInfo(
+    const v8::Arguments& args) {
+  content::RenderView* render_view = GetRenderView();
+  if (!render_view) return v8::Undefined();
+
+  const ThemeBackgroundInfo& theme_info =
+      SearchBox::Get(render_view)->GetThemeBackgroundInfo();
+  v8::Handle<v8::Object> info = v8::Object::New();
+  info->Set(v8::String::New("colorRgba"),
+            UTF16ToV8String(theme_info.color_rgba));
+  info->Set(v8::String::New("imageUrl"),
+            UTF16ToV8String(theme_info.image_url));
+  info->Set(v8::String::New("imageHorizontalAlignment"),
+            UTF16ToV8String(theme_info.image_horizontal_alignment));
+  info->Set(v8::String::New("imageVerticalAlignment"),
+            UTF16ToV8String(theme_info.image_vertical_alignment));
+  info->Set(v8::String::New("imageTiling"),
+            UTF16ToV8String(theme_info.image_tiling));
+  info->Set(v8::String::New("imageHeight"),
+            v8::Int32::New(theme_info.image_height));
+  return info;
+}
+
+
+v8::Handle<v8::Value> SearchBoxExtensionWrapper::GetThemeAreaHeight(
+    const v8::Arguments& args) {
+  content::RenderView* render_view = GetRenderView();
+  if (!render_view) return v8::Undefined();
+
+  return v8::Int32::New(SearchBox::Get(render_view)->GetThemeAreaHeight());
+}
+
 // static
 v8::Handle<v8::Value> SearchBoxExtensionWrapper::NavigateContentWindow(
     const v8::Arguments& args) {
@@ -643,6 +710,17 @@ void SearchBoxExtension::DispatchContextChange(WebKit::WebFrame* frame) {
 }
 
 // static
+void SearchBoxExtension::DispatchThemeChange(WebKit::WebFrame* frame) {
+  Dispatch(frame, kDispatchThemeChangeEventScript);
+}
+
+// static
+void SearchBoxExtension::DispatchThemeAreaHeightChange(
+    WebKit::WebFrame* frame) {
+  Dispatch(frame, kDispatchThemeAreaHeightChangeEventScript);
+}
+
+// static
 v8::Extension* SearchBoxExtension::Get() {
   return new SearchBoxExtensionWrapper(ResourceBundle::GetSharedInstance().
       GetRawDataResource(IDR_SEARCHBOX_API));