Move desktop-specific Instant bits to c/b/ui/search.

This is part 2 of the cleanup described in the attached bug.
Also, added sreeram to c/b/ui/search/OWNERS and dhollowa to c/b/instant/OWNERS.

BUG=179184


Review URL: https://chromiumcodereview.appspot.com/12520005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@188656 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 137 insertions, 0 deletions

diff --git a/chrome/browser/ui/search/instant_loader.h b/chrome/browser/ui/search/instant_loader.h
new file mode 100644
index 0000000..1d5c693
--- /dev/null
+++ b/chrome/browser/ui/search/instant_loader.h
@@ -0,0 +1,137 @@
+// Copyright 2012 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.
+
+#ifndef CHROME_BROWSER_UI_SEARCH_INSTANT_LOADER_H_
+#define CHROME_BROWSER_UI_SEARCH_INSTANT_LOADER_H_
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/timer.h"
+#include "chrome/browser/ui/tab_contents/core_tab_helper_delegate.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/web_contents_delegate.h"
+
+class GURL;
+class Profile;
+
+namespace content {
+struct OpenURLParams;
+class WebContents;
+}
+
+// InstantLoader is used to create and maintain a WebContents where we can
+// preload a page into. It is used by InstantOverlay and InstantNTP to
+// preload an Instant page.
+class InstantLoader : public content::NotificationObserver,
+                      public content::WebContentsDelegate,
+                      public CoreTabHelperDelegate {
+ public:
+  // InstantLoader calls these methods on its delegate in response to certain
+  // changes in the underlying contents.
+  class Delegate {
+   public:
+    // Called after someone has swapped in a different WebContents for ours.
+    virtual void OnSwappedContents() = 0;
+
+    // Called when the underlying contents receive focus.
+    virtual void OnFocus() = 0;
+
+    // Called when the mouse pointer is down.
+    virtual void OnMouseDown() = 0;
+
+    // Called when the mouse pointer is released (or a drag event ends).
+    virtual void OnMouseUp() = 0;
+
+    // Called to open a URL using the underlying contents (see
+    // WebContentsDelegate::OpenURLFromTab). The Delegate should return the
+    // WebContents the URL is opened in, or NULL if the URL wasn't opened
+    // immediately.
+    virtual content::WebContents* OpenURLFromTab(
+        content::WebContents* source,
+        const content::OpenURLParams& params) = 0;
+
+    // Called when a main frame load is complete.
+    virtual void LoadCompletedMainFrame() = 0;
+
+   protected:
+    ~Delegate();
+  };
+
+  explicit InstantLoader(Delegate* delegate);
+  virtual ~InstantLoader();
+
+  // Creates a new WebContents in the context of |profile| that will be used to
+  // load |instant_url|. The page is not actually loaded until Load() is
+  // called. Uses |active_contents|, if non-NULL, to initialize the size of the
+  // new contents. |on_stale_callback| will be called after kStalePageTimeoutMS
+  // has elapsed after Load() being called.
+  void Init(const GURL& instant_url,
+            Profile* profile,
+            const content::WebContents* active_contents,
+            const base::Closure& on_stale_callback);
+
+  // Loads |instant_url_| in |contents_|.
+  void Load();
+
+  // Returns the contents currently held. May be NULL.
+  content::WebContents* contents() const { return contents_.get(); }
+
+  // Replaces the contents held with |contents|. Any existing contents is
+  // deleted. The expiration timer is not restarted.
+  void SetContents(scoped_ptr<content::WebContents> contents);
+
+  // Releases the contents currently held. Must only be called if contents() is
+  // not NULL.
+  scoped_ptr<content::WebContents> ReleaseContents() WARN_UNUSED_RESULT;
+
+ private:
+  // Overridden from content::NotificationObserver:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // Overridden from CoreTabHelperDelegate:
+  virtual void SwapTabContents(content::WebContents* old_contents,
+                               content::WebContents* new_contents) OVERRIDE;
+
+  // Overridden from content::WebContentsDelegate:
+  virtual bool ShouldSuppressDialogs() OVERRIDE;
+  virtual bool ShouldFocusPageAfterCrash() OVERRIDE;
+  virtual void LostCapture() OVERRIDE;
+  virtual void WebContentsFocused(content::WebContents* contents) OVERRIDE;
+  virtual bool CanDownload(content::RenderViewHost* render_view_host,
+                           int request_id,
+                           const std::string& request_method) OVERRIDE;
+  virtual void HandleMouseDown() OVERRIDE;
+  virtual void HandleMouseUp() OVERRIDE;
+  virtual void HandlePointerActivate() OVERRIDE;
+  virtual void HandleGestureEnd() OVERRIDE;
+  virtual void DragEnded() OVERRIDE;
+  virtual bool OnGoToEntryOffset(int offset) OVERRIDE;
+  virtual content::WebContents* OpenURLFromTab(
+      content::WebContents* source,
+      const content::OpenURLParams& params) OVERRIDE;
+
+  Delegate* const delegate_;
+  scoped_ptr<content::WebContents> contents_;
+
+  // The URL we will be loading.
+  GURL instant_url_;
+
+  // Called when |stale_page_timer_| fires.
+  base::Closure on_stale_callback_;
+
+  // Used to mark when the page is stale.
+  base::Timer stale_page_timer_;
+
+  // Used to get notifications about renderers.
+  content::NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(InstantLoader);
+};
+
+#endif  // CHROME_BROWSER_UI_SEARCH_INSTANT_LOADER_H_