Add FakeDisplaySnapshot builder and related changes.

ui/display/fake_display_snapshot.h

Index: ui/display/fake_display_snapshot.h
diff --git a/ui/display/fake_display_snapshot.h b/ui/display/fake_display_snapshot.h
index f1ed1d6daa43ba1c0be3dda070543a4d1a60629f..1f17bf85e91cd60e01030853588bfccdc4052124 100644
--- a/ui/display/fake_display_snapshot.h
+++ b/ui/display/fake_display_snapshot.h
@@ -9,25 +9,88 @@
 
 #include <memory>
 #include <string>
+#include <vector>
 
 #include "base/macros.h"
+#include "ui/display/display.h"
 #include "ui/display/display_export.h"
 #include "ui/display/types/display_mode.h"
 #include "ui/display/types/display_snapshot.h"
+#include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace display {
 
 // A display snapshot that doesn't correspond to a physical display, used when
 // running off device.
-class FakeDisplaySnapshot : public ui::DisplaySnapshot {
+class DISPLAY_EXPORT FakeDisplaySnapshot : public ui::DisplaySnapshot {
  public:
-  // TODO(kylechar): Add a builder.
+  class Builder {
+   public:
+    Builder();
+    ~Builder();
+
+    // Builds new FakeDisplaySnapshot. At the very minimum you must set id and
+    // native display mode before building or it will fail.
+    std::unique_ptr<FakeDisplaySnapshot> Build();
+
+    Builder& SetId(int64_t id);
+    // Adds display mode with |size| and set as native mode. If a display mode
+    // with |size| already exists then it will be reused.
+    Builder& SetNativeMode(const gfx::Size& size);
+    // Adds display mode with |size| and set as current mode. If a display mode
+    // with |size| already exists then it will be reused.
+    Builder& SetCurrentMode(const gfx::Size& size);
+    // Adds display mode with |size| if it doesn't exist.
+    Builder& AddMode(const gfx::Size& size);
+    Builder& SetOrigin(const gfx::Point& origin);
+    Builder& SetType(ui::DisplayConnectionType type);
+    Builder& SetIsAspectPerservingScaling(bool is_aspect_preserving_scaling);
+    Builder& SetHasOverscan(bool has_overscan);
+    Builder& SetHasColorCorrectionMatrix(bool val);
+    Builder& SetName(const std::string& name);
+    Builder& SetProductId(int64_t product_id);
+    // Sets physical_size so that the screen has the specified DPI using the
+    // native resolution.
+    Builder& SetDPI(int dpi);
+    // Sets physical_size for low DPI display.
+    Builder& SetLowDPI();
+    // Sets physical_size for high DPI display.
+    Builder& SetHighDPI();
+
+   private:
+    // Returns a display mode with |size|. If there is no existing mode, insert
+    // a display mode with |size|.
+    const ui::DisplayMode* AddOrFindDisplayMode(const gfx::Size& size);
+
+    int64_t id_ = Display::kInvalidDisplayID;
+    gfx::Point origin_;
+    float dpi_ = 96.0;
+    ui::DisplayConnectionType type_ = ui::DISPLAY_CONNECTION_TYPE_UNKNOWN;
+    bool is_aspect_preserving_scaling_ = false;
+    bool has_overscan_ = false;
+    bool has_color_correction_matrix_ = false;
+    std::string name_ = "Fake Display";
+    int64_t product_id_ = DisplaySnapshot::kInvalidProductID;
+    std::vector<std::unique_ptr<const ui::DisplayMode>> modes_;
+    const ui::DisplayMode* current_mode_ = nullptr;
+    const ui::DisplayMode* native_mode_ = nullptr;
+
+    DISALLOW_COPY_AND_ASSIGN(Builder);
+  };
 
   FakeDisplaySnapshot(int64_t display_id,
-                      const gfx::Size& display_size,
+                      const gfx::Point& origin,
+                      const gfx::Size& physical_size,
                       ui::DisplayConnectionType type,
-                      std::string name);
+                      bool is_aspect_preserving_scaling,
+                      bool has_overscan,
+                      bool has_color_correction_matrix,
+                      std::string display_name,
+                      int64_t product_id,
+                      std::vector<std::unique_ptr<const ui::DisplayMode>> modes,
+                      const ui::DisplayMode* current_mode,
+                      const ui::DisplayMode* native_mode);
   ~FakeDisplaySnapshot() override;
 
   // DisplaySnapshot: