Timeline: Add some theming

While we're at it, also remove all the weird borders and use standard
icons. The timeline doesn't have a "baroque" theme, it's all flat for
now. If the need arises we can add some gradients here and there.

Change-Id: Ia9ce22d7f412c4999feca2284959be4d734267ac
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/libs/timeline/timelinenotesrenderpass.cpp

@@ -27,6 +27,8 @@
 #include "timelinerenderstate.h"
 #include "timelinenotesmodel.h"
 
+#include <utils/theme/theme.h>
+
 namespace Timeline {
 
 struct Point2DWithDistanceFromTop {
@@ -226,6 +228,7 @@ private:
 
     int m_matrix_id;
     int m_z_range_id;
+    int m_color_id;
 };
 
 NotesMaterialShader::NotesMaterialShader()
@@ -240,6 +243,9 @@ void NotesMaterialShader::updateState(const RenderState &state, QSGMaterial *, Q
     if (state.isMatrixDirty()) {
         program()->setUniformValue(m_matrix_id, state.combinedMatrix());
         program()->setUniformValue(m_z_range_id, GLfloat(1.0));
+        program()->setUniformValue(
+                    m_color_id,
+                    Utils::creatorTheme()->color(Utils::Theme::Timeline_HighlightColor));
     }
 }
 
@@ -253,6 +259,7 @@ void NotesMaterialShader::initialize()
 {
     m_matrix_id = program()->uniformLocation("matrix");
     m_z_range_id = program()->uniformLocation("_qt_zRange");
+    m_color_id = program()->uniformLocation("notesColor");
 }
 
 QSGMaterialType *NotesMaterial::type() const