Add ability to set resolution on external display

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index 8b9f9d4c4cdcf3c3b5d0a2da7034290a7a2389c1..386d9c119680f5234ea9ffe4b6348a9dd980080f 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -71,6 +71,8 @@
 #include "base/chromeos/chromeos_version.h"
 #endif  // defined(OS_CHROMEOS)
 
+#include "ash/display/display_info.h"

[oshima, 2013/07/31 16:39:11]

Changes in this file is just for my testing and I'll revert
before landing, so please ignore them.

[Daniel Erat, 2013/07/31 17:34:05]

am i misunderstanding? the change in e.g. HandleScaleUI() doesn't look like it's
for testing

[oshima, 2013/07/31 21:59:49]

Sorry if it wasn't clear enough.
It was for me to test this feature without UI (UI will be added separately).
This file as been removed from CL in the latest patch.

+
 namespace ash {
 namespace {
 
@@ -193,13 +195,45 @@ gfx::Display::Rotation GetNextRotation(gfx::Display::Rotation current) {
     case gfx::Display::ROTATE_270:
       return gfx::Display::ROTATE_0;
   }
-  NOTREACHED() << "Unknown rotation:" << current;
+  NOTREACHED() << "Unknown rotatgion:" << current;

[Daniel Erat, 2013/07/31 17:34:05]

nit: s/rotatgion/rotation/

   return gfx::Display::ROTATE_0;
 }
 
+const gfx::Size& FindNextResolution(
+    const std::vector<internal::Resolution>& resolutions,
+    const gfx::Size& current_resolution) {
+  std::vector<internal::Resolution>::const_iterator iter =
+      resolutions.begin();
+  for (; iter != resolutions.end(); ++iter) {
+    if (iter->size == current_resolution) {
+      ++iter;
+      break;
+    }
+  }
+  if (iter == resolutions.end())
+    return resolutions[0].size;
+  else
+    return iter->size;
+}
+
 bool HandleScaleUI(bool up) {
   internal::DisplayManager* display_manager =
       Shell::GetInstance()->display_manager();
+
+  gfx::Point point = Shell::GetScreen()->GetCursorScreenPoint();
+  gfx::Display display = Shell::GetScreen()->GetDisplayNearestPoint(point);
+  if (!display.IsInternal()) {
+    const DisplayInfo& info = display_manager->GetDisplayInfo(display.id());
+    if (info.resolutions().empty()) {
+      LOG(ERROR) << "No resolution found:";
+      return false;
+    }
+    const gfx::Size& next_resolution =
+        FindNextResolution(info.resolutions(), info.bounds_in_pixel().size());
+    display_manager->SetDisplayResolution(display.id(), next_resolution);
+    return true;
+  }
+
   int64 display_id = display_manager->GetDisplayIdForUIScaling();
   if (display_id == gfx::Display::kInvalidDisplayID)
     return false;