Fix a plugin taking a whole iframe from messing with the page's zoom level....

webkit/glue/plugins/pepper_plugin_instance.cc

 // Copyright (c) 2010 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 "webkit/glue/plugins/pepper_plugin_instance.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #if defined(OS_MACOSX)
 #include "base/mac_util.h"
@@ skipping 226 matching lines @@
 
 const PPB_Fullscreen_Dev ppb_fullscreen = {
   &IsFullscreen,
   &SetFullscreen,
 };
 
 void ZoomChanged(PP_Instance instance_id, double factor) {
   PluginInstance* instance = ResourceTracker::Get()->GetInstance(instance_id);
   if (!instance)
     return;
+
+  // We only want to tell the page to change its zoom if the whole page is the
+  // PDF.  If we're in an iframe, then don't do anything.
+  WebFrame* frame = instance->container()->element().document().frame();
+  if (!frame->view()->mainFrame()->document().isPluginDocument())
+    return;
+
   double zoom_level = WebView::zoomFactorToZoomLevel(factor);
   // The conversino from zoom level to factor, and back, can introduce rounding
   // errors.  i.e. WebKit originally tells us 3.0, but by the time we tell the
   // plugin and it tells us back, the level becomes 3.000000000004.  Need to
   // round or else otherwise if the user zooms out, it will go to 3.0 instead of
   // 2.0.
   int rounded =
       static_cast<int>(zoom_level + (zoom_level > 0 ? 0.001 : -0.001));
   if (abs(rounded - zoom_level) < 0.001)
     zoom_level = rounded;
@@ skipping 906 matching lines @@
 }
 
 Graphics3D* PluginInstance::bound_graphics_3d() const {
   if (bound_graphics_.get() == NULL)
     return NULL;
 
   return bound_graphics_->Cast<Graphics3D>();
 }
 
 }  // namespace pepper