Implement off-screen rendering support using delegated rendering (issue #1257).

This implementation supports both GPU compositing and software compositing (used when GPU is not supported or when passing `--disable-gpu --disable-gpu-compositing` command-line flags). GPU-accelerated features (WebGL and 3D CSS) that did not work with the previous off-screen rendering implementation do work with this implementation when GPU support is available.

Rendering now operates on a per-frame basis. The frame rate is configurable via CefBrowserSettings.windowless_frame_rate up to a maximum of 60fps (potentially limited by how fast the system can generate new frames). CEF generates a bitmap from the compositor backing and passes it to CefRenderHandler::OnPaint.

The previous CefRenderHandler/CefBrowserHost API for off-screen rendering has been restored mostly as-is with some minor changes:

- CefBrowserHost::Invalidate no longer accepts a CefRect region argument. Instead of invalidating a specific region it now triggers generation of a new frame.
- The |dirtyRects| argument to CefRenderHandler::OnPaint will now always be a single CefRect representing the whole view (frame) size. Previously, invalidated regions were listed separately.
- Linux: CefBrowserHost::SendKeyEvent now expects X11 event information instead of GTK event information. See cefclient for an example of converting GTK events to the necessary format.
- Sizes passed to the CefRenderHandler OnPaint and OnPopupSize methods are now already DPI scaled. Previously, the client had to perform DPI scaling.
- Includes drag&drop implementation from issue #1032.
- Includes unit test fixes from issue #1245.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1751 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/browser_host_impl_mac.mm

@@ -8,6 +8,8 @@
 #import <Cocoa/Cocoa.h>
 #import <CoreServices/CoreServices.h>
 
+#include "libcef/browser/render_widget_host_view_osr.h"
+#include "libcef/browser/text_input_client_osr_mac.h"
 #include "libcef/browser/thread_util.h"
 
 #include "base/file_util.h"
@@ -286,6 +288,59 @@ bool CefBrowserHostImpl::PlatformViewText(const std::string& text) {
   return false;
 }
 
+CefTextInputContext CefBrowserHostImpl::GetNSTextInputContext() {
+  if (!IsWindowless()) {
+    NOTREACHED() << "Window rendering is not disabled";
+    return NULL;
+  }
+
+  if (!CEF_CURRENTLY_ON_UIT()) {
+    NOTREACHED() << "Called on invalid thread";
+    return NULL;
+  }
+
+  CefRenderWidgetHostViewOSR* rwhv = static_cast<CefRenderWidgetHostViewOSR*>(
+      GetWebContents()->GetRenderWidgetHostView());
+
+  return rwhv->GetNSTextInputContext();
+}
+
+void CefBrowserHostImpl::HandleKeyEventBeforeTextInputClient(
+    CefEventHandle keyEvent) {
+  if (!IsWindowless()) {
+    NOTREACHED() << "Window rendering is not disabled";
+    return;
+  }
+
+  if (!CEF_CURRENTLY_ON_UIT()) {
+    NOTREACHED() << "Called on invalid thread";
+    return;
+  }
+
+  CefRenderWidgetHostViewOSR* rwhv = static_cast<CefRenderWidgetHostViewOSR*>(
+      GetWebContents()->GetRenderWidgetHostView());
+
+  rwhv->HandleKeyEventBeforeTextInputClient(keyEvent);
+}
+
+void CefBrowserHostImpl::HandleKeyEventAfterTextInputClient(
+    CefEventHandle keyEvent) {
+  if (!IsWindowless()) {
+    NOTREACHED() << "Window rendering is not disabled";
+    return;
+  }
+
+  if (!CEF_CURRENTLY_ON_UIT()) {
+    NOTREACHED() << "Called on invalid thread";
+    return;
+  }
+
+  CefRenderWidgetHostViewOSR* rwhv = static_cast<CefRenderWidgetHostViewOSR*>(
+      GetWebContents()->GetRenderWidgetHostView());
+
+  rwhv->HandleKeyEventAfterTextInputClient(keyEvent);
+}
+
 bool CefBrowserHostImpl::PlatformCreateWindow() {
   base::mac::ScopedNSAutoreleasePool autorelease_pool;
 
@@ -382,7 +437,7 @@ void CefBrowserHostImpl::PlatformSetFocus(bool focus) {
         web_contents_->GetRenderWidgetHostView()) {
       view->SetActive(focus);
 
-      if (focus) {
+      if (focus && !IsWindowless()) {
         // Give keyboard focus to the native view.
         NSView* view = web_contents_->GetContentNativeView();
         DCHECK([view canBecomeKeyView]);
@@ -402,7 +457,7 @@ void CefBrowserHostImpl::PlatformSetWindowVisibility(bool visible) {
 }
 
 CefWindowHandle CefBrowserHostImpl::PlatformGetWindowHandle() {
-  return window_info_.view;
+  return IsWindowless() ? window_info_.parent_view : window_info_.view;
 }
 
 void CefBrowserHostImpl::PlatformHandleKeyboardEvent(
@@ -616,14 +671,21 @@ void CefBrowserHostImpl::PlatformTranslateMouseEvent(
   result.globalX = result.x;
   result.globalY = result.y;
 
-  NSView* view = window_info_.parent_view;
-  if (view) {
-    NSRect bounds = [view bounds];
-    NSPoint view_pt = {result.x, bounds.size.height - result.y};
-    NSPoint window_pt = [view convertPoint:view_pt toView:nil];
-    NSPoint screen_pt = [[view window] convertBaseToScreen:window_pt];
-    result.globalX = screen_pt.x;
-    result.globalY = screen_pt.y;
+  if (IsWindowless()) {
+    GetClient()->GetRenderHandler()->GetScreenPoint(
+        GetBrowser(),
+        result.x, result.y,
+        result.globalX, result.globalY);
+  } else {
+    NSView* view = window_info_.parent_view;
+    if (view) {
+      NSRect bounds = [view bounds];
+      NSPoint view_pt = {result.x, bounds.size.height - result.y};
+      NSPoint window_pt = [view convertPoint:view_pt toView:nil];
+      NSPoint screen_pt = [[view window] convertBaseToScreen:window_pt];
+      result.globalX = screen_pt.x;
+      result.globalY = screen_pt.y;
+    }
   }
 
   // modifiers