linux_aura: Enable HIDPI support

ui/base/x/x11_util.cc

 // Copyright (c) 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.
 
 // This file defines utility functions for X11 (Linux only). This code has been
 // ported from XCB since we can't use XCB on Ubuntu while its 32-bit support
 // remains woefully incomplete.
 
 #include "ui/base/x/x11_util.h"
 
@@ skipping 242 matching lines @@
 #endif  // defined(USE_AURA)
 
 bool IsShapeAvailable() {
   int dummy;
   static bool is_shape_available =
     XShapeQueryExtension(gfx::GetXDisplay(), &dummy, &dummy);
   return is_shape_available;
 
 }
 
+// A list of bogus sizes in mm that X detects that should be ignored.
+// See crbug.com/136533. The first element maintains the minimum
+// size required to be valid size.
+const unsigned long kInvalidDisplaySizeList[][2] = {
+  {40, 30},
+  {50, 40},
+  {160, 90},
+  {160, 100},
+};
+
 }  // namespace
 
 bool XDisplayExists() {
   return (gfx::GetXDisplay() != NULL);
 }
 
 bool IsXInput2Available() {
   return DeviceDataManager::GetInstance()->IsXInput2Available();
 }
 
@@ skipping 1054 matching lines @@
   // TODO(erg): Actually doing this correctly would require pulling out xrandr,
   // which we don't even do in the desktop screen yet.
   ::XDisplay* display = gfx::GetXDisplay();
   ::Screen* screen = DefaultScreenOfDisplay(display);
   int width = WidthOfScreen(screen);
   int height = HeightOfScreen(screen);
   return window_rect.size() == gfx::Size(width, height);
 #endif
 }
 
+bool IsXDisplaySizeBlackListed(unsigned long mm_width,
+                               unsigned long mm_height) {
+  // Ignore if the reported display is smaller than minimum size.
+  if (mm_width <= kInvalidDisplaySizeList[0][0] ||
+      mm_height <= kInvalidDisplaySizeList[0][1]) {
+    LOG(WARNING) << "Smaller than minimum display size";
+    return true;
+  }
+  for (unsigned long i = 1 ; i < arraysize(kInvalidDisplaySizeList); ++i) {
+    const unsigned long* size = kInvalidDisplaySizeList[i];
+    if (mm_width == size[0] && mm_height == size[1]) {
+      LOG(WARNING) << "Black listed display size detected:"
+                   << size[0] << "x" << size[1];
+      return true;
+    }
+  }
+  return false;
+}
+
 const unsigned char* XRefcountedMemory::front() const {
   return x11_data_;
 }
 
 size_t XRefcountedMemory::size() const {
   return length_;
 }
 
 XRefcountedMemory::~XRefcountedMemory() {
   XFree(x11_data_);
@@ skipping 157 matching lines @@
       << "request_code " << static_cast<int>(error_event.request_code) << ", "
       << "minor_code " << static_cast<int>(error_event.minor_code)
       << " (" << request_str << ")";
 }
 
 // ----------------------------------------------------------------------------
 // End of x11_util_internal.h
 
 
 }  // namespace ui