Fix page zoom to be frame-centric for out-of-process frames.

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index 75eb253259897225c60c7184b24abd0e17336b15..30da716411f03352c7626ca6e874755cc109d6d8 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -224,6 +224,21 @@ class CONTENT_EXPORT WebContentsImpl
           const ui::AXTreeUpdate&)>;
   void RequestAXTreeSnapshot(AXTreeSnapshotCallback callback);
 
+  // Set a temporary zoom level for the frames associated with this WebContents.
+  // If |is_temporary| is true, we are setting a new temporary zoom level,
+  // otherwise we are clearing a previously set temporary zoom level.
+  void SetTemporaryZoomLevel(double level, bool is_temporary);
+
+  // Sets the zoom level for frames associated with this WebContents.
+  void UpdateZoom(double level);
+
+  // Sets the zoom level for frames associated with this WebContents if it
+  // matches |host| and (if non-empty) |scheme|. Matching is done on the
+  // last committed entry.
+  void UpdateZoomIfNecessary(const std::string& scheme,
+                             const std::string& host,
+                             double level);
+
   // WebContents ------------------------------------------------------
   WebContentsDelegate* GetDelegate() override;
   void SetDelegate(WebContentsDelegate* delegate) override;
@@ -427,6 +442,7 @@ class CONTENT_EXPORT WebContentsImpl
   void UpdateEncoding(RenderFrameHost* render_frame_host,
                       const std::string& encoding) override;
   WebContents* GetAsWebContents() override;
+  double PageZoomLevel() override;
   bool IsNeverVisible() override;
   AccessibilityMode GetAccessibilityMode() const override;
   void AccessibilityEventReceived(