PPAPI: Don't round zoom levels to the nearest integer.

webkit/plugins/ppapi/ppapi_plugin_instance.cc

 // Copyright (c) 2011 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/plugins/ppapi/ppapi_plugin_instance.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
@@ skipping 1828 matching lines @@
                                             uint32_t event_classes) {
   input_event_mask_ &= ~(event_classes);
   filtered_input_event_mask_ &= ~(event_classes);
 }
 
 void PluginInstance::ZoomChanged(PP_Instance instance, double factor) {
   // We only want to tell the page to change its zoom if the whole page is the
   // plugin.  If we're in an iframe, then don't do anything.
   if (!IsFullPagePlugin())
     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;
-  container()->zoomLevelChanged(zoom_level);
+  container()->zoomLevelChanged(WebView::zoomFactorToZoomLevel(factor));
 }
 
 void PluginInstance::ZoomLimitsChanged(PP_Instance instance,
                                        double minimum_factor,
                                        double maximium_factor) {
   if (minimum_factor > maximium_factor) {
     NOTREACHED();
     return;
   }
   delegate()->ZoomLimitsChanged(minimum_factor, maximium_factor);
@@ skipping 154 matching lines @@
   screen_size_for_fullscreen_ = gfx::Size();
   WebElement element = container_->element();
   element.setAttribute(WebString::fromUTF8(kWidth), width_before_fullscreen_);
   element.setAttribute(WebString::fromUTF8(kHeight), height_before_fullscreen_);
   element.setAttribute(WebString::fromUTF8(kBorder), border_before_fullscreen_);
   element.setAttribute(WebString::fromUTF8(kStyle), style_before_fullscreen_);
 }
 
 }  // namespace ppapi
 }  // namespace webkit