[Mac] Implement the system dictionary popup by implementing NSTextInput methods.

chrome/renderer/render_widget.cc

Index: chrome/renderer/render_widget.cc
diff --git a/chrome/renderer/render_widget.cc b/chrome/renderer/render_widget.cc
index 4637167195c2cdcf78ce025f5ea43002ec01fb8d..c6eef89c57ababfad65120ef8255be8037a98b8b 100644
--- a/chrome/renderer/render_widget.cc
+++ b/chrome/renderer/render_widget.cc
@@ -14,6 +14,7 @@
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/render_messages_params.h"
+#include "chrome/common/text_input_client_messages.h"
 #include "chrome/renderer/render_process.h"
 #include "chrome/renderer/render_thread.h"
 #include "chrome/renderer/renderer_webkitclient_impl.h"
@@ -23,6 +24,7 @@
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebCursorInfo.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPopupMenu.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebPopupMenuInfo.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebRange.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebRect.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebScreenInfo.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebSize.h"
@@ -48,6 +50,7 @@ using WebKit::WebNavigationPolicy;
 using WebKit::WebPopupMenu;
 using WebKit::WebPopupMenuInfo;
 using WebKit::WebPopupType;
+using WebKit::WebRange;
 using WebKit::WebRect;
 using WebKit::WebScreenInfo;
 using WebKit::WebSize;
@@ -875,19 +878,37 @@ void RenderWidget::OnImeSetComposition(
     int selection_start, int selection_end) {
   if (!webwidget_)
     return;
-  if (!webwidget_->setComposition(
+  if (webwidget_->setComposition(
       text, WebVector<WebCompositionUnderline>(underlines),
       selection_start, selection_end)) {
+    // Setting the IME composition was successful. Send the new composition
+    // range to the browser.
+    WebRange range = webwidget_->compositionRange();
+    if (range.isNull()) {
+      // The IME was cancelled via the Esc key, so just send back the caret.
+      range = webwidget_->caretOrSelectionRange();
+    }
+    Send(new TextInputClientViewHostMsg_ImeCompositionRangeChanged(routing_id(),
+        range.startOffset(), range.endOffset()));
+  } else {
     // If we failed to set the composition text, then we need to let the browser
     // process to cancel the input method's ongoing composition session, to make
     // sure we are in a consistent state.
     Send(new ViewHostMsg_ImeCancelComposition(routing_id()));
+    // Send an updated IME range with just the caret range.
+    WebRange range = webwidget_->caretOrSelectionRange();
+    Send(new TextInputClientViewHostMsg_ImeCompositionRangeChanged(routing_id(),
+        range.startOffset(), range.endOffset()));
   }
 }
 
 void RenderWidget::OnImeConfirmComposition(const string16& text) {
   if (webwidget_)
     webwidget_->confirmComposition(text);
+  // Send an updated IME range with just the caret range.
+  WebRange range = webwidget_->caretOrSelectionRange();
+  Send(new TextInputClientViewHostMsg_ImeCompositionRangeChanged(routing_id(),
+      range.startOffset(), range.endOffset()));
 }
 
 // This message causes the renderer to render an image of the
@@ -1079,6 +1100,13 @@ void RenderWidget::resetInputMethod() {
     if (webwidget_->confirmComposition())
       Send(new ViewHostMsg_ImeCancelComposition(routing_id()));
   }
+
+  // Send an updated IME range with the current caret rect.
+  WebRange range = webwidget_->caretOrSelectionRange();
+  if (!range.isNull()) {
+    Send(new TextInputClientViewHostMsg_ImeCompositionRangeChanged(routing_id(),
+        range.startOffset(), range.endOffset()));
+  }
 }
 
 void RenderWidget::SchedulePluginMove(