Change the display list interest rect size to 4000px instead of 8000px.

cc/playback/display_list_recording_source_unittest.cc

Index: cc/playback/display_list_recording_source_unittest.cc
diff --git a/cc/playback/display_list_recording_source_unittest.cc b/cc/playback/display_list_recording_source_unittest.cc
index 1e602c270fb2a23651e49bb9baef6447d89b44a5..97811260f02a6f56a77e7e5ac86eb28bb7df3063 100644
--- a/cc/playback/display_list_recording_source_unittest.cc
+++ b/cc/playback/display_list_recording_source_unittest.cc
@@ -329,20 +329,20 @@ TEST_F(DisplayListRecordingSourceTest,
   recording_source.UpdateAndExpandInvalidation(
       &client, &invalidation, layer_size, visible_rect, 0,
       RecordingSource::RECORD_NORMALLY);
-  EXPECT_EQ(gfx::Rect(0, 0, 8256, 8256), recording_source.recorded_viewport());
+  EXPECT_EQ(gfx::Rect(0, 0, 4256, 4256), recording_source.recorded_viewport());
 
   visible_rect.Offset(0, 512);
   recording_source.UpdateAndExpandInvalidation(
       &client, &invalidation, layer_size, visible_rect, 0,
       RecordingSource::RECORD_NORMALLY);
-  EXPECT_EQ(gfx::Rect(0, 0, 8256, 8256), recording_source.recorded_viewport());
+  EXPECT_EQ(gfx::Rect(0, 0, 4256, 4256), recording_source.recorded_viewport());
 
   // Move past the threshold for enough exposed new area.
   visible_rect.Offset(0, 1);
   recording_source.UpdateAndExpandInvalidation(
       &client, &invalidation, layer_size, visible_rect, 0,
       RecordingSource::RECORD_NORMALLY);
-  EXPECT_EQ(gfx::Rect(0, 0, 8256, 8769), recording_source.recorded_viewport());
+  EXPECT_EQ(gfx::Rect(0, 0, 4256, 4769), recording_source.recorded_viewport());
 
   // Make the bottom of the potential new recorded viewport coincide with the
   // layer's bottom edge.
@@ -350,7 +350,7 @@ TEST_F(DisplayListRecordingSourceTest,
   recording_source.UpdateAndExpandInvalidation(
       &client, &invalidation, layer_size, visible_rect, 0,
       RecordingSource::RECORD_NORMALLY);
-  EXPECT_EQ(gfx::Rect(0, 0, 8256, 9000), recording_source.recorded_viewport());
+  EXPECT_EQ(gfx::Rect(0, 0, 4256, 4769), recording_source.recorded_viewport());
 }
 
 }  // namespace