Initial pass at integrating Differ into the chromoting host code....

remoting/host/capturer_fake_ascii.cc

Index: remoting/host/capturer_fake_ascii.cc
===================================================================
--- remoting/host/capturer_fake_ascii.cc	(revision 55264)
+++ remoting/host/capturer_fake_ascii.cc	(working copy)
@@ -18,19 +18,6 @@
 CapturerFakeAscii::~CapturerFakeAscii() {
 }
 
-void CapturerFakeAscii::CaptureRects(const RectVector& rects,
-                                     CaptureCompletedCallback* callback) {
-  GenerateImage();
-  DataPlanes planes;
-  planes.data[0] = buffers_[current_buffer_].get();
-  planes.strides[0] = bytes_per_row_;
-  scoped_refptr<CaptureData> capture_data(new CaptureData(planes,
-                                                          width_,
-                                                          height_,
-                                                          pixel_format_));
-  FinishCapture(capture_data, callback);
-}
-
 void CapturerFakeAscii::ScreenConfigurationChanged() {
   width_ = kWidth;
   height_ = kHeight;
@@ -44,6 +31,26 @@
   }
 }
 
+void CapturerFakeAscii::CalculateInvalidRects() {
+  // Capture and invalidate the entire screen.
+  // Performing the capture here is modelled on the Windows
+  // GDI capturer.
+  GenerateImage();
+  InvalidateFullScreen();
+}
+
+void CapturerFakeAscii::CaptureRects(const InvalidRects& rects,
+                                     CaptureCompletedCallback* callback) {
+  DataPlanes planes;
+  planes.data[0] = buffers_[current_buffer_].get();
+  planes.strides[0] = bytes_per_row_;
+  scoped_refptr<CaptureData> capture_data(new CaptureData(planes,
+                                                          width_,
+                                                          height_,
+                                                          pixel_format_));
+  FinishCapture(capture_data, callback);
+}
+
 void CapturerFakeAscii::GenerateImage() {
   for (int y = 0; y < height_; ++y) {
     uint8* row = buffers_[current_buffer_].get() + bytes_per_row_ * y;