Added support for Text only zoom...

chrome/browser/views/tab_contents/tab_contents_view_win.cc

Index: chrome/browser/views/tab_contents/tab_contents_view_win.cc
===================================================================
--- chrome/browser/views/tab_contents/tab_contents_view_win.cc	(revision 19223)
+++ chrome/browser/views/tab_contents/tab_contents_view_win.cc	(working copy)
@@ -483,7 +483,17 @@
     case WM_MOUSEWHEEL:
       // This message is reflected from the view() to this window.
       if (GET_KEYSTATE_WPARAM(message->wParam) & MK_CONTROL) {
-        WheelZoom(GET_WHEEL_DELTA_WPARAM(message->wParam));
+        PageZoom::Function zoom_type;
+        const bool zoom_in = GET_WHEEL_DELTA_WPARAM(message->wParam) > 0;
+
+        if (GET_KEYSTATE_WPARAM(message->wParam) & MK_SHIFT) {
+          zoom_type = zoom_in ? PageZoom::TEXT_ONLY_LARGER :
+                                PageZoom::TEXT_ONLY_SMALLER;
+        } else {
+          zoom_type = zoom_in ? PageZoom::LARGER : PageZoom::SMALLER;
+        }
+
+        WheelZoom(zoom_type);
         return 1;
       }
       break;
@@ -592,30 +602,32 @@
   //    content has focus, although FF and IE require that the mouse is over
   //    content.  This is because all events get forwarded when content has
   //    focus.
+  const int zoom_text_only = GetAsyncKeyState(VK_SHIFT) & 0x8000;
+
   if (GetAsyncKeyState(VK_CONTROL) & 0x8000) {
-    int distance = 0;
+    PageZoom::Function zoom_type;
     switch (scroll_type) {
       case SB_LINEUP:
-        distance = WHEEL_DELTA;
+        zoom_type = zoom_text_only ? PageZoom::TEXT_ONLY_LARGER :
+                                     PageZoom::LARGER;
         break;
       case SB_LINEDOWN:
-        distance = -WHEEL_DELTA;
+        zoom_type = zoom_text_only ? PageZoom::TEXT_ONLY_SMALLER :
+                                     PageZoom::SMALLER;
         break;
         // TODO(joshia): Handle SB_PAGEUP, SB_PAGEDOWN, SB_THUMBPOSITION,
         // and SB_THUMBTRACK for completeness
       default:
-        break;
+        return false;
     }
 
-    WheelZoom(distance);
+    WheelZoom(zoom_type);
     return true;
   }
   return false;
 }
 
-void TabContentsViewWin::WheelZoom(int distance) {
-  if (tab_contents()->delegate()) {
-    bool zoom_in = distance > 0;
-    tab_contents()->delegate()->ContentsZoomChange(zoom_in);
-  }
+void TabContentsViewWin::WheelZoom(PageZoom::Function zoom_type) {
+  if (tab_contents()->delegate())
+    tab_contents()->delegate()->ContentsZoomChange(zoom_type);
 }